Chapter 4 - Proportions, Percents, and Solving Inequalities - 4.3 - More on Percents and Problem Solving - Problem Set 4.3 - Page 162: 42

The selling price for the video games should be 45 dollars.

Let s represent the selling price. We can use the following guideline to solve this problem: Selling price = Cost + Profit s = 25 + 80% $\times$ 25 s = 25 + .8 $\times$ 25 s = 25 + 20 s = 45 The selling price for the video games should be 45 dollars.