Percent Change & Error
2.1 & 2.7
2.1 & 2.7
A hoodie originally cost $45. Its price is now $36. What is the percent decrease?
20%
A sweatshirt costs $48 before tax. The sales tax rate is 7.5%. How much sales tax will you pay?
$3.60
A shirt originally costs $50 and is 20% off. How much money will you save?
$10.00
Jasmine deposits $500 into an account earning 4% simple annual interest for 3 years. How much interest will he earn in 3 years?
$60
A salesperson earns a 6% commission on $900 in sales. How much commission does the salesperson earn?
$54
The price of a bag of Takis increased from $4 to $5. What is the percent increase?
25%
A gaming headset costs $65 before tax. The sales tax rate is 8%. What is the total cost?
$70.20
A pair of sneakers originally costs $84. They are on sale for 25% off. What is the sale price before tax?
$63.00
Noah deposits $600 into an account earning 4% simple annual interest. How much interest will he earn in 3 years?
$72.00
A concert ticket costs $75 before fees. The website charges a service fee equal to 4% of the ticket price. What is the service fee?
$3
Maya bought 60 tickets at a carnival. After playing some games, she had 42 tickets left. What is the percent decrease in her tickets?
30%
A restaurant bill is $146.80 before tax and tip. A student says a 20% tip is $28.36. Is the student correct? If not, state the correct tip.
No. The correct tip is $29.36.
A jacket is on sale for $54 after a 40% discount. What was its original price?
$90.00
Sofia deposits $1,200 into an account earning 3.5% simple annual interest. She makes no additional deposits or withdrawals. What will the total balance be after 2 years?
$1,284.00
A salesperson earns $350 per week plus 7.5% commission on sales. This week, the salesperson sells $2,400 in merchandise. What are the total weekly earnings?
$530
A student estimated that a backpack weighed 5.4 pounds. Its actual weight was 5.8 pounds. What was the percent error, to the nearest tenth of a percent?
6.9%
A clothing store buys a jacket for $32 and marks up its cost by 35%. What is the selling price before tax?
$43.20
A pair of boots originally costs $90. The store offers 30% off, then charges 8% sales tax on the discounted price. What is the final cost?
$68.04
Ethan borrows $800 at 6% simple annual interest for 9 months. How much interest will he owe?
$36
You sell a pair of sneakers online for $280. The selling platform keeps 12.5% of the sale price as a fee. How much money do you receive after the fee?
$245
Diego estimated that a project would take 48 minutes. It actually took 40 minutes. He divided the difference by 48 to calculate percent error. Explain his mistake and state the correct percent error.
He should divide by the actual time of 40 minutes. The correct percent error is 20%.
A family’s restaurant subtotal is $72. Sales tax is 8.5%, and they leave an 18% tip. Both tax and tip are calculated on the subtotal. What is the total amount paid?
$91.08
Two stores sell the same $80 hoodie. Store A offers 30% off. Store B offers 20% off, followed by an additional 15% off the discounted price. Which store has the lower price before tax, and by how much?
Store B, by $1.60. Store A charges $56.00; Store B charges $54.40.
An account earns $90 in simple interest over 3 years at an annual rate of 5%. What was the original deposit?
$600
A salesperson can choose between two weekly pay plans. Plan A pays $200 plus 4% commission on sales. Plan B pays 12% commission on sales with no base pay. If weekly sales are $3,000, which plan pays more, and by how much?
Plan B pays $40.00 more. Plan A pays $320.00; Plan B pays $360.00.