Simple Interest, Percent Change, Percent Error

Find the percent errors for Trial A and Trial B.

• Trial A = 10%

• Trial A = 9%

• Trial B = 33%

• Trial B = 50%

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

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 15, the new quantity is 18. Is this a percent increase or decrease and what is the percent change? YOU WILL CHOOSE 2 OPTIONS.

• increase

• decrease

• 2%

• 20%

• 17%

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%

The original quantity is 50 and the new quantity is 85. What is the percent increase? DO NOT TYPE THE PERCENT SIGN.

Suppose you deposited $600 in a savings account 3 years ago. The simple interest rate is 3.1%. The interest that you earned in those 3 years is $55.80. Which of the following is/are true? YOU MAY CHOOSE MORE THAN ONE ANSWER

• r = 3.1%

• P = 3

• I = $55.80

• T = 600

You invest $2,500 in each of two accounts. Account A earns simple interest rate of 3% over 2 years and Account B earns simple interest at a rate of 6% over 15 months. Find the interest earned in each account. YOU WILL CHOOSE MORE THAN ONE ANSWER.

• Account A = $1,500

• Account A = $150

• Account B = $187.50

• Account B = $1,875

• Account B = $2250

Edward deposited $4,000 into a savings account 4 years ago. The simple interest rate is 2%. How much money did Edward earn in interest? What is his new account balance? YOU WILL CHOOSE 2 ANSWERS.

• $320

• $3,200

• $3,680

• $4,320

• 1,280,000