GMAT Math : DSQ: Calculating percents

Study concepts, example questions & explanations for GMAT Math

Create An Account

All GMAT Math Resources

22 Diagnostic Tests 693 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #1 : Percents

What percent of students in a school are freshmen with glasses?

(1) Of the freshmen in the school, 10% wear glasses.

(2) Of the non-freshmen in the school, 20% wear glasses.

Possible Answers:

Statements (1) and (2) TOGETHER are NOT sufficient to answer the question asked, and additional data specific to the problem are needed.

Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient to answer the question asked.

EACH statement ALONE is sufficient to answer the question asked.

BOTH statements (1) and (2) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient to answer the question asked.

Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient to answer the question asked.

Correct answer:

Statements (1) and (2) TOGETHER are NOT sufficient to answer the question asked, and additional data specific to the problem are needed.

Explanation:

To answer this question, it is necessary to know the total number of students in the school and the number of freshmen with glasses.

(1) This indicates that 10% of the freshmen have glasses; neither the total number of freshmen nor the total number of students in the school is provided $\dpi{100} \small \rightarrow$ NOT sufficient.

(2) Provides the percent of non-freshmen who wear glasses (irrelevant to the question at hand). It does not provide the total number of students in the school or the number of freshmen with glasses $\dpi{100} \small \rightarrow$ NOT sufficient.

From (1) and (2), the percent of non-freshmen with glasses is known and the percent of the freshmen with glasses is known, but not the percent of the school who are freshmen with glasses.

For example:

If there are 100 freshmen, including 10 freshmen with glasses, and 100 non-freshmen, including 20 non-freshmen with glasses, then $\dpi{100} \small \frac{10}{200}=5\%$ of the school are freshmen with glasses.

If there are 300 freshmen, including 30 freshmen with glasses and 100 non-freshmen, including 20 non-freshmen with glasses, then $\dpi{100} \small \frac{30}{400}=7.5\%$ of the school are freshmen with glasses.

Both statements together are not sufficient.

Report an Error

Example Question #1 : Percents

In 2013 there are 300 employees at Company ABC. If the number of employees at Company ABC increased by 200% from 1993 to 2013, by what percent did the number of employees at Company ABC increase from 2003 to 2013?

(1) In 2003 there were 160 employees at Company ABC.

(2) From 1993 to 2003 the number of employees increased by 60% at Company ABC.

Possible Answers:

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

Correct answer:

D. EACH statement ALONE is sufficient.

Explanation:

For statement (1), since we know the numbers of employees in 2003 and 2013, we can directly calculate the percentage change: $\frac{(300 - 160)}{160}= 87.5\%$ .

For statement (2), since we know the percentage change from 1993 to 2013 and the percentage change from 1993 to 2003, we can set the percentage change from 2003 to 2013 to be and then calculate from the following:

$(1 + 60\%) \cdot (1 + x) = 1+200\%$ .

Solve and we can get $x = 87.5\%$ .

Report an Error

Example Question #2 : Percents

Data sufficiency question- do not actually solve the question

How many male students are in a class?

1. There are 42 students in the class.

2. 55 percent of the students are female.

Possible Answers:

Each statement alone is sufficient

Statement 1 alone is sufficient but statement 2 alone is not sufficient to answer the question

Statements 1 and 2 together are not sufficient, and additional data is neeeded to answer the question

Both statements taken together are sufficienct to answer the question, but neither statement alone is sufficient

Statement 2 alone is sufficient, but statement 1 along is not sufficient to answer the question

Correct answer:

Both statements taken together are sufficienct to answer the question, but neither statement alone is sufficient

Explanation:

In order to calculate the number of males in the class, you need to know the total number of students and the number of females (which can be calculated using the percentage).

Report an Error

Example Question #3 : Percents

Data sufficiency question- do not actually solve the question

There are 20 cats in an animal shelter. How many black, female cats are in the shelter?

1. 14 of the cats are male

2. 25 percent of the cats are black

Possible Answers:

Statements 1 and 2 together are not sufficient, and additional data is needed to answer the question

Statement 2 alone is sufficient, but statement 1 is not sufficient to answer the question

Each statement alone is sufficient to answer the question

Both statements taken together are sufficient to answer the question, but neither statement alone is sufficient

Statement 1 alone is sufficient, but statement 2 is not sufficient to answer the question

Correct answer:

Statements 1 and 2 together are not sufficient, and additional data is needed to answer the question

Explanation:

The information provided will allow you to calculate the number of females and the number of black cats, but there is not enough information to quantify the number of black, female cats

Report an Error

Example Question #3 : Percents

A certain pet store sells cats and dogs. The number of dogs is 250% greater than the number of cats. How many cats are in the store?

1. There are 40 dogs in the store.

2. There are 56 cats and dogs in the store.

Possible Answers:

Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

EACH statement ALONE is sufficient.

Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

Statement (1) and (2) TOGETHER are NOT sufficient to answer the question asked, and additional data are needed.

BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

Correct answer:

EACH statement ALONE is sufficient.

Explanation:

$dogs = 2.5 \times cats$

Statement 1: sufficient

$40\: dogs = 2.5 \times cats$

$cats = \frac{40}{2.5}=16$

Statement 2: sufficient

$56 \, total = 2.5x + x= 3.5x$

$cats = x=\frac{56}{3.5}=16$

Report an Error

Example Question #4 : Percents

Mrs. Smith purchased groceries whose price, before tax, was $147.64. What was the tax rate on those groceries (nearest hundredth of a percent)?

1) The tax she paid was $9.23.

2) The total amount she paid was $156.87

Possible Answers:

BOTH statements TOGETHER are NOT sufficient to answer the question.

BOTH statements TOGETHER are sufficient to answer the question, but NEITHER statement ALONE is sufficient to answer the question.

Statement 1 ALONE is sufficient to answer the question, but Statement 2 ALONE is not sufficient.

EITHER Statement 1 or Statement 2 ALONE is sufficient to answer the question.

Statement 2 ALONE is sufficient to answer the question, but Statement 1 ALONE is not sufficient.

Correct answer:

EITHER Statement 1 or Statement 2 ALONE is sufficient to answer the question.

Explanation:

To determine the tax rate, you need to know the purchase price, which is given, and the amount of tax paid. The amount of tax is given in Statement 1. Statement 2 alone, however, also allows you to find the amount of tax; just subtract:

$\$ 156.87 -\$ 147.64 = \$ 9.23$

Either way, you can now find the tax rate:

$\frac{9.23}{147.64} \cdot 100 \approx 0.0625 = 6.25\%$

Report an Error

Example Question #5 : Percents

Jared, a jewelry salesman, makes a 10% commission on the selling price of all the jewelry he sells. Last month, he earned $4,000 in commission. What is the total selling price of the jewelry he sold this month?

1. His sales this month were 25% more than his sales last month.

2. He earned $5,000 in commission this month.

Possible Answers:

BOTH statements (1) and (2) TOGETHER are sufficient to answer the question asked, but NEITHER statement ALONE is sufficient to answer the question asked.

Statements (1) and (2) TOGETHER are NOT sufficient to answer the question asked, and additional data specific to the problem are needed.

Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient to answer the question asked.

Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient to answer the question asked.

EACH statement ALONE is sufficient to answer the question asked.

Correct answer:

EACH statement ALONE is sufficient to answer the question asked.

Explanation:

Each statement has enough information to calculate the answer.

Using statement 1, we know that he sold 25% more than last month. Given in the question, last month he earned $4,000. If $4,000 is 10% of the total price of his jewelry sold last month, we do some math (below) to find he sold $40,000 worth of jewelry. Let be the total price of jewelry sold last month. Then,

$\$4000=0.10x$ so

x=40,000

Increasing that by 25% we see that

$40,000\cdot 1.25=50,000$

NOTE: when multiplying the percents, make sure you use the decimal values.

Using statement 2, we know that we can just calculate the total selling price of the jewelry he sold this month based on the commission percentage. So, if we let equal the total price of jewelry sold this month, we get $\$5000=.10y$

$y=\$50,000$

Therefore we see we can use either statement individually to find what we are looking for.

Report an Error

Example Question #6 : Percents

A distributor ordered 3,250 chairs. 2,315 chairs were delivered. What percentage of the chairs have not yet been delivered?

Possible Answers:

$3.4\%$

$71.3\%$

$18.6\%$

$63.2\%$

$28.7\%$

Correct answer:

$28.7\%$

Explanation:

First let's find the number of chairs not delivered:

$3,250-2,315=935\ \textup{undelivered chairs}$

Therefore the fraction of chairs not delivered is $\frac{935}{3,250}$ .

Divide the numerator by the denominator to convert this fraction into a decimal:

$935\div 3,250=0.287$

Multiply by 100 to turn this decimal into a percentage:

$0.287\cdot 100=28.7\%$

Report an Error

Example Question #1272 : Data Sufficiency Questions

What percent of a company's employees are women with a college degree?

(1) Of the women employed in the company, $40\%$ do not have a college degree.

(2) Of the men employed in the company, $80\%$ have a college degree.

Possible Answers:

Each statement ALONE is sufficient.

Both statements TOGETHER are not sufficient.

Both statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient

Statement (2) ALONE is sufficient, but Statement (1) ALONE is not sufficient

Statement (1) ALONE is sufficient, but Statement (2) ALONE is not sufficient

Correct answer:

Both statements TOGETHER are not sufficient.

Explanation:

Statement (1) indicates the percentage of women who do not have a college degree. From that statement, we know that 60% of the women in the company have a college degree. However, we do not know the total number of employees or the total number of women in the company. Therefore, statement (1) alone is not sufficient.

Statement (2) indicates the percentage of men who have a college degree but from that statement we cannot find the total number of employees or the total number of women with a college degree.

We need the total number of women and the total number of employees in order to calculate the percentage of employees who are women with a college degree. We show it with the following example:

If we assume that there are 100 women and 100 men working in the company, we can attempt to find the percentage of employees who are women with a college degree in the following way:

$\frac{(100-40)}{100+100}=\frac{60}{200}=\frac{30}{100}$

So in that example, 30% of the employees are women with a college degree.

However if we change the number of women to 500 and the number of men to 600, the percentage of employees who are women with a college degree is:

$\frac{(0.6\times 500)}{500+700}=\frac{300}{1200}=\frac{25}{100}$

The percentage of employees who are women with a college degree becomes 25%.

Therefore both statements together are not sufficient.

Report an Error

Example Question #9 : Percents

is 30% of , and 60% of . and are positive integers.

True or false: is a positive integer.

Statement 1: is a multiple of 5.

Statement 2: is a multiple of 5.

Possible Answers:

Statement 1 ALONE is sufficient to answer the question, but Statement 2 ALONE is NOT sufficient to answer the question.

EITHER statement ALONE is sufficient to answer the question.

BOTH statements TOGETHER are sufficient to answer the question, but NEITHER statement ALONE is sufficient to answer the question.

BOTH statements TOGETHER are insufficient to answer the question.

Statement 2 ALONE is sufficient to answer the question, but Statement 1 ALONE is NOT sufficient to answer the question.

Correct answer:

Statement 2 ALONE is sufficient to answer the question, but Statement 1 ALONE is NOT sufficient to answer the question.

Explanation:

Statement 1 alone is inconclusive. For example, if N = 10 , then is 30% of 10 - that is,

$X = 0.30N = 0.30\cdot 10 = 3$ ,

an integer.

But if N = 15 , then is 30% of 15 - that is,

$X = 0.30N = 0.30\cdot 15 = 4.5$ ,

not an integer.

If Statement 2 alone is assumed, then Y = 5M for some integer . 60% of this is

$X = 0.60 \cdot 5M = 3M$ .

is three times an integer and is itself an integer.

Report an Error

All GMAT Math Resources

22 Diagnostic Tests 693 Practice Tests Question of the Day Flashcards Learn by Concept

Popular Subjects

Calculus Tutors in Chicago, ISEE Tutors in San Diego, LSAT Tutors in Los Angeles, Spanish Tutors in Houston, ACT Tutors in Boston, Reading Tutors in Phoenix, Math Tutors in Philadelphia, LSAT Tutors in Atlanta, Math Tutors in Los Angeles, GMAT Tutors in Phoenix

Popular Courses & Classes

GMAT Courses & Classes in San Francisco-Bay Area, Spanish Courses & Classes in Seattle, SSAT Courses & Classes in Houston, SAT Courses & Classes in Miami, MCAT Courses & Classes in Dallas Fort Worth, ACT Courses & Classes in San Diego, SAT Courses & Classes in Denver, SAT Courses & Classes in San Diego, GRE Courses & Classes in Philadelphia, LSAT Courses & Classes in Boston

Popular Test Prep

LSAT Test Prep in Dallas Fort Worth, SAT Test Prep in Washington DC, SSAT Test Prep in San Francisco-Bay Area, SAT Test Prep in Houston, ISEE Test Prep in New York City, ISEE Test Prep in Atlanta, GMAT Test Prep in San Diego, ISEE Test Prep in Phoenix, ACT Test Prep in Atlanta, SAT Test Prep in Denver

DMCA Complaint

If you believe that content available by means of the Website (as defined in our Terms of Service) infringes one or more of your copyrights, please notify us by providing a written notice (“Infringement Notice”) containing the information described below to the designated agent listed below. If Varsity Tutors takes action in response to an Infringement Notice, it will make a good faith attempt to contact the party that made such content available by means of the most recent email address, if any, provided by such party to Varsity Tutors.

Your Infringement Notice may be forwarded to the party that made the content available or to third parties such as ChillingEffects.org.

Please be advised that you will be liable for damages (including costs and attorneys’ fees) if you materially misrepresent that a product or activity is infringing your copyrights. Thus, if you are not sure content located on or linked-to by the Website infringes your copyright, you should consider first contacting an attorney.

Please follow these steps to file a notice:

You must include the following:

A physical or electronic signature of the copyright owner or a person authorized to act on their behalf; An identification of the copyright claimed to have been infringed; A description of the nature and exact location of the content that you claim to infringe your copyright, in \ sufficient detail to permit Varsity Tutors to find and positively identify that content; for example we require a link to the specific question (not just the name of the question) that contains the content and a description of which specific portion of the question – an image, a link, the text, etc – your complaint refers to; Your name, address, telephone number and email address; and A statement by you: (a) that you believe in good faith that the use of the content that you claim to infringe your copyright is not authorized by law, or by the copyright owner or such owner’s agent; (b) that all of the information contained in your Infringement Notice is accurate, and (c) under penalty of perjury, that you are either the copyright owner or a person authorized to act on their behalf.

Send your complaint to our designated agent at:

Charles Cohn Varsity Tutors LLC
101 S. Hanley Rd, Suite 300
St. Louis, MO 63105

Or fill out the form below:

Do not fill in this field

Contact Information

* Full legal name

Company name

* Phone number

* Email address

Address

* Address1

Address2

* City

* State

* Zipcode

* Country

Complaint Details

* URL of copyrighted work (where your original material is located)

* Please describe the copyrighted work so that it may be easily identified

I am the owner, or an agent authorized to act on behalf of the owner of an exclusive right that is allegedly infringed.

I have a good faith belief that the use of the material in the manner complained of is not authorized by the copyright owner, its agent, or the law.

This notification is accurate.

I acknowledge that there may be adverse legal consequences for making false or bad faith allegations of copyright infringement by using this process.

* Signature (your digital signature is legally binding)

Email address:
Your name:
Feedback:

GMAT Math : DSQ: Calculating percents

Study concepts, example questions & explanations for GMAT Math

All GMAT Math Resources

Example Questions

Example Question #1 : Percents

Example Question #1 : Percents

Example Question #2 : Percents

Example Question #3 : Percents

Example Question #3 : Percents

Example Question #4 : Percents

Example Question #5 : Percents

Example Question #6 : Percents

Example Question #1272 : Data Sufficiency Questions

Example Question #9 : Percents

All GMAT Math Resources

Report an issue with this question

DMCA Complaint

Contact Information

Address

Complaint Details