2002 AMC 8 Problems/Problem 14

Problem 14

A merchant offers a large group of items at off. Later, the merchant takes off these sale prices and claims that the final price of these items is off the original price. The total discount is

Solution #1

Let's assume that each item is . First we take off off of $$100\cdot0.70=$70$ (Error compiling LaTeX. Unknown error_msg)

Next, we take off the extra as asked by the problem. $$70\cdot0.80=$56$ (Error compiling LaTeX. Unknown error_msg)

So the final price of an item is . We have to do because was the final price and we wanted the discount.

so the final discount was