Compound Interest

Change 6.75% to a decimal.

• 67.5
• .675
• 675
• .0675

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CCSS.5.NBT.A.3

Caiden earned $475 from mowing lawns last summer. He deposited this money in an account that pays an interest rate of 3.8% compounded annually. What will be his balance after 15 year?

• $827.52
• $831.10
• $839.45
• $846.80

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The compound interest formula is:
A = P(1 + r)^t

What does the A represent?

• The amount of interest earned.
• The amount of time that has passed.
• The total amount of money after a certain amount of time.
• The amount required to invest.

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CCSS.HSA.SSE.A.1

You take out a loan for $175,000. Which option will cost you less?

A) Simple Interest rate of 4.17% over 15 years

B) Compound Interest rate of 3.5% over 15 years

• Option A

• Option B

• they are both equal

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You invested $1,900 at 4% interest compounded annually for 3 years.  How much interest did you earn in 3 years?

• $2,372.40
• $237.24
• $2,137.24
• $3,197.60

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CCSS.HSF.BF.A.2

Your allowance of $190 earned an interest of 11% compounded annually for 1 2/3 years.  How much interest did you earn on your allowance?

• $343.90
• $153.90
• $226.10
• $36.10

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Write the percent as a decimal. 
4.3%

• 4.3
• .43
• .043
• 4300

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Bruno was given $2000 when he turned 3 years old.  His parents invested it at a 2% interest rate compounded annually.  No deposits or withdrawls were made.  Which expression can be used to determine how much money Bruno had in the account when he turned 16? 

• 2000(1+0.02)¹³
• 2000(1-0.02)¹³
• 2000(1+0.02)¹⁶
• 2000(1-0.02)¹⁶

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CCSS.HSF.BF.A.2

Starting money = $350.

Interest rate = 2.5%

TIme = 3 years.

How much simple interest?

• 7.50

• 26.25

• 87.5

• 262.50

Emilio borrows $1200 from a bank with 8% simple interest per year.  How much will he have to pay back total in 2 years?

• $150
• $192
• $1350
• $1392

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CCSS.HSF.BF.A.2