Percent of Increase/Decrease, Percent of Error, Simple Interest

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.

Find the percent of decrease (to the nearest percent)

Original: 196

New: 174

• 10%

• 11%

• 12%

• 13%

The label on a package of bolts says each bolt has a diameter of 0.35 inches. One bolt has the diameter of 0.33 inches. What is the percent error?

• .94%

• 94%

• 5.7%

• 57%

Jonah earned $150.36 in interest on an account that earns 1.4% simple interest. If Jonah opened the account 12 years ago, what was the principal amount?

• $850

• $868

• $880

• $895

• $902

The attendance for the basketball game was estimated to be 15,000 people but 12,500 people attended. What was the percent error?

• 16.67%

• 20%

• 2500%

• 80%

Find the percent of increase.

Original: 32

New: 50

• 10%

• 36%

• 52%

• 56%

A group of wildlife conservationists are trying to determine what is causing a recent decrease in the number of white-tail deer in a particular area. Two years ago, they estimated the population to be 680. Recently, the population was estimated to be 410. Which is closest to the percent of change in the white-tail deer population?

• 40%

• 66%

• 270%

• 54%

Last week, you finished level 2 of a video game in 32 minutes. Today, you finished level 2 in 28 minutes. What is your percent of change?

• Increase 12.5%

• Decrease 12.5%

• Increase 4%

• Decrease 4%

Jane received $875 from her graduation party. She put the money in a bank with a 4% simple interest rate. How much interest will she have earned after 7 years?

• $205

• $225

• $245

• $2,250

• $2,450