A product price rises from 80 to 100. The percent increase is which of the following?

• A. 20%
• B. 15%
• C. 25%
• D. 33%

Answer: (C)

Percent change is found by comparing the amount of increase to the original value. Here, the price rises from 80 to 100, so the increase is 20. Compare that to the original price: 20 divided by 80 equals 0.25. Multiply by 100% to convert to a percentage, giving 25%. An equivalent way is to see 100/80 = 1.25, which represents a 25% increase.