Percent Increase/Decrease

Original Quantity: 10

New Quantity: 5

Calculate the percent change.

• 5

• 5%

• 50

• 50%

The number of people signed up for a bus trip increased from 32 to 45. What is the percent increase? Round to the nearest percent.

• 52%

• 41%

• 42%

• 45%

Answer explanation

To find the percent increase, subtract the original number (32) from the new number (45), which gives 13. Then, divide by the original number (32) and multiply by 100: (13/32) * 100 = 40.625%. Rounding gives 41%, the correct answer.

The regular price of a scooter is $65.50. It is on sale for $52.40. What is the percent decrease from the regular price to the sale price of the scooter? 

• 35%

• 25%

• 30%

• 20%

Answer explanation

To find the percent decrease, subtract the sale price from the regular price: $65.50 - $52.40 = $13.10. Then, divide the decrease by the regular price: $13.10 / $65.50 ≈ 0.20. Multiply by 100 to get 20%, the correct answer.

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? 

• $164

• $256

• $404

• $324

Answer explanation

In September, she earned 8% more than $300. Calculate 8% of $300: 0.08 * 300 = $24. Add this to her August earnings: 300 + 24 = $324. Therefore, she earned $324 in September.

Find the new amount given the original amount and the percent of change.
340 pages; 20% decrease 

• 320 pages

• 240 pages

• 272 pages

• 360 pages

Answer explanation

To find the new amount after a 20% decrease from 340 pages, calculate 20% of 340, which is 68. Subtract this from 340: 340 - 68 = 272 pages. Thus, the new amount is 272 pages.

Mrs. Ciampa 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%

• 10%

• 11%

• 50%

Answer explanation

To find the percent change, use the formula: ((new value - old value) / old value) x 100. Here, ((30 - 27) / 27) x 100 = (3 / 27) x 100 ≈ 11%. Thus, the percent change is 11%.

• A

• B

• C

• D

Sally went to the clearance rack at a department store and found a shirt she wanted to buy.  The shirt was $36.00 and is on sale for $24.00.  What is the percent of the decrease?

• 33%

• 67%

• 50%

• 34%

Mrs. Ciampa 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%

One week, 72 people got a speeding ticket. The next week, only 36 people got a speeding ticket. What is the percent of change in the speeding tickets?

• Increase 50%

• Decrease 50%

• Increase 1%

• Decrease 1%