Percent Error, Percent of Change, Simple Interest

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. How much is the simple interest?

• $6.40

• $1.60

• $0.016

• $200

• $2

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 principal?

• $6.40

• $200

• $1.60

• $0.016

• $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.

Zach​'s savings account earns 2.5​% simple interest per year. The balance in his savings account at the beginning of the year is ​$1,200. If Zach makes no deposits or withdrawals for a whole​ year, which is closest to the balance he should have in his savings account at the end of the​ year?

• $3,000

• $30

• $1,450

• $1,230

The original quantity is 18 and the new quantity is 35, is this a percent increase or decrease and estimate the percent change. YOU WILL CHOOSE 2 OPTIONS

• increase

• decrease

• 100%

• 75%

• 50%

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%

Ann works in a supermarket for $10.00 per hour. She received a raise to $12.00. What is the percent of change in her hourly wage?

• Increase 16.67%

• Decrease 16.67%

• Increase 20%

• Decrease 20%