A price increases from $60 to $66. What is the percent increase?

A price increases from $60 to $66. What is the percent increase?

• A. 12%
• B. 8%
• C. 15%
• D. 10%

Answer: (D)

The key idea is how to find a percent increase: compare the change to the original amount. Here, the price rises from 60 to 66, so the increase is 66 − 60 = 6. The percent increase is (increase ÷ original) × 100 = (6 ÷ 60) × 100 = 0.10 × 100 = 10%. So the correct result is 10%. Thinking through the other options: 12% of 60 would be 7.2, 8% would be 4.8, and 15% would be 9, which wouldn’t give a 6-dollar increase.

The key idea is how to find a percent increase: compare the change to the original amount. Here, the price rises from 60 to 66, so the increase is 66 − 60 = 6. The percent increase is (increase ÷ original) × 100 = (6 ÷ 60) × 100 = 0.10 × 100 = 10%.

So the correct result is 10%. Thinking through the other options: 12% of 60 would be 7.2, 8% would be 4.8, and 15% would be 9, which wouldn’t give a 6-dollar increase.