Practice!

Sample Problem

The price of a computer in an electronic store was decreased by 12% to 440 dollars.

(a)  What was the original price of the computer?

$ .00

(b) The price of the computer decreased a further 5%. Find the overall percentage decrease of the price of this kind of computer. 

%

Solution

(a) The original price $440 ÷ (1 – 12%) = $440 ÷ 0.88 = $500

(b) The price of the computer after further decreased: $440 × (1 – 5%) = $418

Then, the overall percentage decrease: (500 - 418) ÷ 500 = 82 ÷ 500 = 0.164 = 16.4%