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SAT Math : How to find compound interest

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Example Question #1 : How To Find Compound Interest

A five-year bond is opened with $\$5000$ in it and an interest rate of 2.5 %, compounded annually. This account is allowed to compound for five years. Which of the following most closely approximates the total amount in the account after that period of time?

Possible Answers:

$\$5625$

$\$5657$

$\$5518$

$\$6143$

$\$5811$

Correct answer:

$\$5657$

Explanation:

Each year, you can calculate your interest by multiplying the principle ( $\$5000$ ) by 1.025 . For one year, this would be:

1.025*5000=5125

For two years, it would be:

5125*1.025 , which is the same as 1.025*1.025*5000

Therefore, you can solve for a five year period by doing:

1.025^5*5000

Using your calculator, you can expand the 1.025^5 into a series of multiplications. This gives you 5657.041064453125 , which is closest to $\$5657$ .

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Example Question #2 : How To Find Compound Interest

If a cash deposit account is opened with $\$7500$ for a three year period at 3.5 % interest compounded once annually, which of the following is closest to the positive difference between the interest accrued in the third year and the interest accrued in the second year?

Possible Answers:

$\$0$

$\$11.41$

$\$281.2$

$\$81.41$

$\$9.51$

Correct answer:

$\$9.51$

Explanation:

It is easiest to break this down into steps. For each year, you will multiply by 1.035 to calculate the new value. Therefore, let's make a chart:

After year 1: 7500*1.035=7762.5 ; Total interest: 262.5

After year 2: 7762.5*1.035=8034.1875 ; Let us round this to 8034.19 ; Total interest: 271.69

After year 3: 8034.19 * 1.035 = 8315.38665 ; Let us round this to 8315.39 ; Total interest: 281.2

Thus, the positive difference of the interest from the last period and the interest from the first period is: 281.2-271.69=9.51

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Example Question #1 : Pattern Behaviors In Exponents

Jack has $\$15$ , 000 to invest. If he invests two-thirds of it into a high-yield savings account with an annual interest rate of $8\%$ , compounded quarterly, and the other third in a regular savings account at $6\%$ simple interest, how much does Jack earn after one year?

Possible Answers:

$\$1051.32$

$\$1124.32$

$\$901.43$

$\$1081.98$

$\$1128.75$

Correct answer:

$\$1124.32$

Explanation:

First, break the problem into two segments: the amount Jack invests in the high-yield savings, and the amount Jack invests in the simple interest account (10,000 and 5,000 respectively).

Now let's work with the high-yield savings account. $10,000 is invested at an annual rate of 8%, compounded quarterly. We can use the compound interest formula to solve:

$\text{Final Balance}=\text{ Principal} \cdot \bigg(1+\frac{\text{Interest Rate}}{c}\bigg)^{(\text{Time})(c)}$

Plug in the values given:

$=10,000\cdot \bigg(1+\frac{.08}{4}\bigg)^{(1)(4)}$

$=10,000 \cdot (1.02)^{4}$

=10,824.32

Therefore, Jack makes $824.32 off his high-yield savings account. Now let's calculate the other interest:

$\text{Interest}=\text{Principal} \cdot \text{ Interest Rate} \cdot \text{ Time}$

$=5,000 \cdot (0.06)\cdot (1)$

=300

Add the two together, and we see that Jack makes a total of, $\$1124.32$ off of his investments.

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Example Question #2 : Pattern Behaviors In Exponents

A truck was bought for $\$ 20,000$ in 2008, and it depreciates at a rate of $13\%$ per year. What is the value of the truck in 2016? Round to the nearest cent.

Possible Answers:

y= 6764.23

y= 6664.23

y= 5664.23

y= 16564

y= 6564.23

Correct answer:

y= 6564.23

Explanation:

The first step is to convert the depreciation rate into a decimal. $13\%=0.13$ . Now lets recall the exponential decay model. y=C(1-r)^t , where is the starting amount of money, is the annual rate of decay, and is time (in years). After substituting, we get

y=20000(1-0.13)^8

y=20000(0.87)^8

$y=20000\cdot 0.3282117$

y= 6564.23

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SAT Math : How to find compound interest

Study concepts, example questions & explanations for SAT Math

All SAT Math Resources

Example Questions

Example Question #1 : How To Find Compound Interest

Example Question #2 : How To Find Compound Interest

Example Question #1 : Pattern Behaviors In Exponents

Example Question #2 : Pattern Behaviors In Exponents

All SAT Math Resources

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