Simple Interest, Percent Change, Percent Error

Suppose you deposit $700 in a bank with a simple interest rate of 3.4%. You want to keep your deposit in the bank long enough to earn at least $150 in interest. How long should you keep your deposit in the bank? ROUND UP TO THE NEXT FULL YEAR. ONLY TYPE THE NUMBER.

Find the balance of an account after 5 years that you deposited $4,400 with an interest rate of 8%. DO NOT TYPE A DOLLAR SIGN OR ANY COMMAS OR SPACES.

You deposit $600 into a savings account that earns simple interest. After 5 years your balance is $720. Find the interest rate.

HINT: FIND THE AMOUNT OF INTEREST YOU HAVE FIRST

ONLY TYPE THE NUMBER, NOT THE PERCENT SIGN

To find simple​ interest, you multiply the principal​ (in dollars), the interest rate​ (as a​ decimal), and the time in years. The equation 6.40=200•0.016•2 shows how to find the simple interest for a certain account after 2 years. What is the interest rate​ (as a​ percent)?

• 6.40%

• 200%

• 0.016%

• 1.6%

• 2%

An account has a principal of ​$100 and a simple interest rate of 3.8​%. The table shows the simple interest earned and the new account balance for​ 1, 2, and 3 years. Complete the table for the fourth year. YOU WILL CHOOSE 2 ANSWERS.

• $3.80

• $15.20

• $115.20

• $126.60

Find the principal if you earn $5.25 in interest after 21 months and the simple interest rate was 2.0%.

DO NOT TYPE A DOLLAR SIGN.

You estimate that 200 people attend a school concert. The actual attendance was 240.   What is the percent error?

• 20%

• 18%

• 16%

• 17%

You guessed that the Chicago Cubs would win 95 games during the regular season. They actually won 103. What was your percent error? Round to the nearest tenth if necessary.

• 7.8%

• 7.7%

• 0.77%

• 0.78%

You guess that Lebron James would score 35 points during the game. He actually scored 28. Find your percent error.

• 30%

• 33%

• 75%

• 25%

Find the percent of change if the original cost was $5 and the new cost is $1. 

• Increase $4

• Decrease $4

• Decrease 80%

• Decrease 400%