A little while back, we introduced some money problems that involved variables in the question and answer. We’re going to continue on the theme of money problems with some questions about percent changes in price. We've all had practice figuring out the sale price on things we buy, but these questions have the potential to be tricky. The benefit is that there is a formula we can use:

Percent change = (y – x)/x

(where x = original price, and y = new price)