Solving Problems About Percent Increase or Decrease

The average number of shirts sold in the shop was 285 every day in summer. As the temperature was lower and lower, the average number of shirts decreased to 114 every day. What was the percentage decrease of in the average number of shirts sold in the shop?

• 60%

• 40%

• 150%

• 171%

The inventory of single houses is 980 in the housing market last year. After some of them were sold, there are 637 single houses left. What was the percentage decrease in the number of single houses?

• 65%

• 35%

• 53%

• 34%

The usual price of a TV set was $500. During the Christmas holiday, the price of a TV set marked down to $413. What was the percentage decrease in the price of a TV set?

• 82.6%

• 87%

• 17.4%

• 25%

Darren makes $10 per hour. Next semester, he will be making $14 per hour. What rate of increase does this represent? Round the answer to the nearest tenth of a percent.

• 28.5%

• 40%

• 71%

• 60%

John had 136 ml liquid medicine in the bottle. After John took some medicine, there was 119 ml liquid medicine left in the bottle. What was the percentage decrease in the volume of liquid medicine?

• 12.5%

• 14.2%

• 87.5%

• 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%

Find the percent increase. Round to the nearest percent.
From $5 to $8 

• 40%
• 60%
• 55%
• 65%

Find each percent decrease. Round to the nearest percent.
From $80 to $64 

• 35%
• 10%
• 20%
• 25%