Intro into Percent
Percent of Change
Percent Error
Simple Interest
Word Problems
100
How do you set up the percent proportion?
is %
of 100
100
How do you set up a percent of change proportion?
change %
original 100
100
Write the percent error proportion
100
Mrs. Baxter deposits $2,000 in an account that earns 5% simple interest. How much is Mrs. Baxter’s investment worth after 8 years?
$2,800
100
A toy manufacturer estimates that 6% of its products are defective. If 550 toys are produced in one day, how many will be defective?
x=33
200
60% of what number is 45?
75
200
What is the percent of change in the cost of a pizza?
20%
200
A birthday party host planned for 20 people, but 17 actually attended. What is the percent error?
17.6%
200
Joey made a deposit into an account that earns 6% simple interest. After 3 years, Joey had earned $400. How much was Joey’s initial deposit?
$2,222.22
200
Eddie is reading a novel for English class. He has read 173 out of 480 pages. About what percent of the book has he read?
36%
300
What percent of 40 is 25?
62.5%
300
What is the percent of change in the cost of a hot dog?
-20%
300
Each bag of cereal should contain 350 grams. A box was selected at random and weighed 342 grams. What is the percent error?
2.3%
300
Peter is calculating the interest earned on a deposit of $275 in an account that earns 8% simple interest after 12 years.
I = prt
I = 275(0.8)(12)
I = 2,640
What did Peter do incorrectly?
Peter wrote the rate as 0.8 instead of 0.08.
300
Francis heard that a car stereo system was on sale for 30% off. If the sale price was $57.75, what was the original price of the stereo?
$82.50
400
42 is 35% of what number?
120
400
A baby weighs 18 pounds at her four-month appointment. Six months later, she weighs 24 pounds. By what percentage did the baby’s weight increase?
33.3334%
400
The distance around a neighborhood is 4 miles. When clocking it with an odometer, the distance was 3.8 miles. What is the percent error?
5%
400
Coach Cliffman made a deposit of $1,800 into an account that earns$108 on 2% annual simple interest. How many years did that take him?
3 years
400
Mr. Robins earns a commission on each airfare he books. At the end of the day, he had booked $208.60 worth of airfare and earned $31.29. What is Mr. Robins’ commission rate?
15%
500
What is 125% of 64?
80
500
In 2020, summer camp registration was $15 more than it was in 2021. In 2020, registration was $285. By what percentage did the summer camp registration decrease in 2021?
-5%
500
A postage box should weigh 1.0 pound. If there is a 5% error on the weight, what is the range of acceptable weight?
0.95 - 1.05 lb
500
Isabella is calculating the interest earned on a deposit of $3,000 in an account that earns 4% simple interest after 6 years. What is the total in her account now?
$3720
500
Taylor plans to borrow $4,500 from the bank to purchase a used vehicle. If he borrows the money at a rate of 4% interest for 2 years, what is the total amount he will have to pay back to the bank?
$4,860