Basic Arithmetic : Basic Arithmetic
Study concepts, example questions & explanations for Basic Arithmetic
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Example Questions
Example Question #2 : Other Ratios And Rates
Sara has a weekly salary of 
First you find the total amount of sales that Sara made this week by selling six lamps at $200 a piece:
Sara gets a 6% commission on her sales, so next you find what 6% of 1,200 is:
So, Sara makes $72 from commission this week. However, we can't forget about the $500 weekly salary she also gets! We add her week's commission plus weekly salary to find the total amount she makes during this particular week:
Example Question #1 : Other Ratios And Rates
Maggie works on an 
There is not enough information to answer the question.
We can interpret the information given in the question as "150 is 8% of some number, or whatever amount Maggie's sale is." We can turn this sentence into algebra by calling "some number" x:
From here, we solve for x by isolating it on one side of the equation:
Maggie's sale was $1,875.
Example Question #1 : Other Ratios And Rates
Waitress Kelly sold 
From the information given in the question, we can ask ourselves the following question- $120 is what percent of $670? We can turn this into algebra by calling "what number" x:
From here, we solve for x by isolating it on the right side of the equation:
Rounding to the nearest tenth gives us 17.9, so the final answer is 17.9%.
Example Question #1 : Other Ratios And Rates
In a football game, a team won 
The team has won 5 games.
The number of played games is 25.
Therefore, the ratio of winnings to the total is:
Example Question #1 : Finding Percent Change
In 2012, a university received 150,249 applicants. In 2013, the same university received 190,201 applicants. By what percent did the total number of applicants increase from 2012 to 2013?
To find the percent change, use the following formula:
Our new number of applicants is 190,201, while the original number of applicants is 150,249.
Example Question #1 : Increase
In January, Widget Company made 
To find the percent increase, use the following formula:
In the case of Widget Company,
Therefore, the percent increase is
Example Question #1 : Increase
Derek ran his first mile in 
What is the percent increase between the time it took Derek to run the first and second mile?
The correct answer is a percent change (increase) of 
This can be calculated using the following equation:
Therefore, the answer is a percent increase of 
Example Question #1 : Finding Percent Change
In May of the past year, Harry's company made 
To find percent change, use the following formula:
Our new value is the profit in June, $210,219. Our old value is the profit in May, $189,281.
Example Question #1 : Decrease
In March, an athlete weighed 
The formula to find percentage change is
So for our athlete, our new weight is 170 pounds, and the original weight is 195 pounds.
Because the question already tells us that we need to find the percent lost, or percent decrease, we can drop the negative sign in the answer.
Example Question #2 : Finding Percent Change
Last month the shirt you wanted to buy cost 
1. Subtract the lower price from the higher price.
2. Divide the difference or amount of change by the initial price:
or 10% price decrease
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