Percent of error/change
Aaron’s score on a pre-algebra test was 92. His score on a second pre-algebra test was 84. Which of the following is closest to the percent of decrease in Aaron’s score?
8.7%
A sales tax of 7% was added to the $36.00 price of a jacket. What was the total cost of the jacket?
$38.52
Ellie received a 20% discount on the purchase of 9 shirts that were originally priced at $11.65 each. What was the total cost of the 9 shirts after the discount?
$83.88
Kim’s lunch cost $12.74. She included a tip that was about 15% of the cost of her lunch. Which is closest to the amount Kim included as a tip?
$2.00
Ashley has $200 in a savings account that earns 4% interest per year. Which is closest to the amount that will be in her account after 5 years if no withdrawals or deposits, other than annual simple interest, are made?
$240
Beth paid $15 for a pair of sunglasses that were originally $20. What was the percentage of decrease in the cost of the sunglasses?
25%
Luke bought a computer for $525 and two computer games for $34.99 each. The sales tax rate was 6.25%. How much sales tax was Luke charged?
$37.19
Daniel’s mother has a 15% discount coupon she plans to use at the grocery store today. After the discount is applied, how much will she pay for an item that originally costs $7.80, before applying sales tax?
$6.63
Mr. Charles bought dinner for his family.
About how much tip did Mr. Charles leave?
$7.00
Mark works at a clothing store and earns a 20% commission on his total sales. Last month, Mark sold $1,500 in clothing total sales. What was his commission last month?
$300
Denise measured the length of her yard to be 90 feet. The actual length is 86 feet. What is the approximate percent of error in her measurement?
4.7%
A shirt on sale for 10% off the original price was then reduced by an additional 30% off the sale price. What was the final cost of the shirt if the regular price was $28.50?
$17.96
Erin is buying a television with an original price of $650. She receives a 20% discount. How much will Erin pay, before tax, for the television?
$520
Jill’s lunch bill was $13.85. She gave the server a 15% tip. What was the total cost of Jill’s lunch?
$15.93
Jake earns 15% commission on the total amount he sells. If he sells $545 worth of items, how much commission does Jake earn?
$81.75
Alex measured the length of an item to be 3.7 cm. The actual length is 3.5 cm. What is Alex’s percent error?
5.7%
Five friends went out to dinner. They each paid $13.75 for the meal, including a 7% sales tax. What was the total cost of the meal, including tax?
$73.56
A math club receives a 12% discount on calculators. If each calculator costs $15 before the discount, how much will the club spend on 60 calculators after the discount?
$792
Suzanne will pay $14 to get her hair cut. She wants to leave the hairdresser a 10% tip. What is the total cost of the haircut, including tip?
$15.40
A seventh-grade class raised $380 during a candy sale. They deposited the money in a savings account for 6 months. If the bank pays 5.3% simple interest per year, how much money will be in the account after 6 months?
$390.07
Last year, 576 students attended a local middle school. This year, 721 students attended the school. What is the approximate percent increase in the number of students at the school?
25%
Maureen paid $198.75 for a stereo system, plus a sales tax of $15.90. Approximately, what is the sales tax percent?
8%
A CD player is on sale for $90 at an electronics store. If the original price was $125, what is the percent of discount?
28%
Kendra is serving two tables at the diner where she works. At the first table, the bill was $37.40, and she received 15% of the bill amount as a tip. At the second table, the bill was $34.50, and the tip was 18% of the bill amount. At which table did Kendra receive the bigger tip, and how much more did she get?
Second table; $0.60
Gina deposited $5,450 in a savings account that earns a simple interest rate of 4.7% annually. If Gina keeps the money in the account for 18 months, making no more deposits or withdrawals, approximately how much money will be in her account at the end of 18 months?
$5,834