increase in price percentage

Question

in 1990, the cost of u.s. postage stamp was 25 cents. in 2010, the cost of a u.s. postage stamp was 44 cents. in 20 years what was the percentage of increase in the cost u.s. postage stamps

Answer 1

25 cents to 50 cents would be a 100% increase

25 to 44 cents is a little less than 100%

The increase is 44-25 = 19

19/25 = 76/100 = 0.76 = 76% increase