Interest: simple and compound compared

Answer Key - Grade 7 Math Worksheet

Circle the best answer, or write your answer on the line.

1. 1.

   The school garden club's pretend fund holds $1,200 and earns 2% simple interest each year. Luz wants the interest after 6 years. How much is it?

   $144
2. 2.

   Mr. Cole's pretend savings account holds $850 and earns 4% simple interest each year. Milo wants the interest after 3 years. How much is it?

   $102
3. 3.

   Ms. Yates's pretend savings account holds $320 and earns 5% simple interest each year. Noah wants the interest after 5 years. How much is it?

   $80
4. 4.

   The art club's pretend fund holds $250 and earns 6% simple interest each year. Zee wants the balance after 4 years. How much is in the account then?

   $310
5. 5.

   The class trip fund started with $500 and earned $165 in simple interest over 3 years. Esme works out the yearly rate. What percent is the rate?

   11
6. 6.

   Mr. Grove's pretend savings account started with $250 and earned $90 in simple interest over 3 years. Jun works out the yearly rate. What percent is the rate?

   12
7. 7.

   Ms. Yates's pretend savings account holds $250 and earns 7% compound interest each year. Kira wants the balance after 2 years. To the nearest cent, how much is it?

   $286.23
8. 8.

   The class trip fund holds $400 and earns 5% compound interest each year. Luz wants the balance after 2 years. To the nearest cent, how much is it?

   $441

9. Read this first

   Savings table

   Year	Start	Interest	End
   1	$500	$20	$520
   2	$520	?	?

10. 9.

    Ms. Shaw's pretend savings account earns 4% compound interest each year. Pia reads the table. To the nearest cent, what is the end of year 2?

    $540.80
11. 10.

    The school garden club's pretend fund earns 3% compound interest each year. Zee reads the table. To the nearest cent, what is the end of year 2?

    $636.54