Percent, Percent Change and Percent Error

A sweater is $43. It is on sale for 20% off. What is the final price?

• $47

• $34.40

• $23

• $8.60

A shoe sales associate earned $300 in August. In September she earned 8% more than she did in August. How much did she earn in September?

• $308

• $324

• $200

• $380

An Ipad that costs $500 is on sale for 15% off. Then has a 6% tax. What's the final price?

• $450.50

• $521

• $491

• $400

Sam thinks the cost of the book is $50, but actually it's $56. What is Sam's percent of error?

• 10.7%

• 6%

• 12%

• 89%

Last week, the price of American cheese was $5 per pound. This week, it costs $6 per pound. What is the percent change? 

• Increase 20%

• Decrease 20%

• Increase $1

• Decrease $1

You estimate that 200 people attend a school concert. The actual attendance was 240.   What is the percent error?

• 20%

• -20%

• -16.7%

• 16.7%

Mrs. Tagliaferro had 27 students in her class last year and this year she had 30 students in her math class. What is the percent of change?

• 24%

• 20%

• 11%

• 50%

Mary currently weighs 150 pounds. Before her diet she, weighed 180 pounds. What is the percent of change in her weight?

• 17% Decrease

• 17% Increase

• 20% Increase

• 20% Decrease

A school's population increased from 1250 to 2000 students. What was the percent of increase?

• .375%

• .6%

• 37.5%

• 60%

You estimate that you sent 135 texts last week, but when you get the bill it was actually 108. What was your percent error?

• 20%

• 25%

• -20%

• -25%