Markups & Markdowns
1. A basketball team won 15 games and lost 5 games. What percent of their games did they win?
75%
What is the formula for percent change?
(new-old)/old x 100
What is the formula for percent error?
(approximate-exact)/exact x 100
Wat is the formula for simple interest?
I = prt (I like to party!)
2. Maria bought a pair of shoes that originally cost $80. The store was having a 25% off sale. How much did Maria pay for the shoes?
$60
Can percent change be negative?
Yes! It is called a percent decrease!
8. In science class, Jamal measured the length of a pencil to be 18.5 cm. The actual length was 19 cm. What is the percent error in Jamal's measurement?
2.6%
12. Malik deposited $500 in a savings account that earns 3% simple interest per year. How much interest will he earn after 2 years?
$30
3. Carlos is buying a video game that costs $45. He has a coupon for being student of the month at his school for 20% off any video game. If the sales tax rate is 6%, what is the final cost of the video game?
$38.16
5. The price of a laptop increased from $600 to $690. What was the percent change in the price?
15%
9. Tyler estimated that his fish tank holds 35 liters of water. The actual capacity is 32 liters. What is the percent error in Tyler's estimate?
9.4%
13. Emma invested $1,200 in an account that pays 4% simple interest annually. What will be the total amount in her account after 3 years?
$1,344
4. Sophia's family had dinner at a restaurant. Their bill was $78.50. If they want to leave a 15% tip, how much should they leave as a tip?
$11.78
6. Last month, the number of students in the chess club decreased from 20 to 16. What was the percent change?
20%
10. Leila estimated the height of a tree to be 15 feet. The actual height was 16.5 feet. What is the percent error in her estimation?
9.1%
14. Jackson's parents invested $2,500 in a college fund that earns 2.5% simple interest per year. How much will be in the account after 48 months?
$2,750
What is the correct order to solve for Tip, Discount, and Tax if they're in the same question?
Discount, Tax, Tip
7. The enrollment at Lincoln Middle School decreased from 850 students to 782 students. What was the percent decrease in enrollment?
8%
11. A student measured the mass of a rock as 125 grams, but the actual mass was 120 grams. What is the percent error in the student's measurement?
4.2%
15. Olivia put $750 in a savings account with a 3.5% annual simple interest rate. What is the total amount in the account after 18 months?
$789.38