1. Example 4 Finding an Original Amount Lamps A furniture store marks up the wholesale price of a desk lamp by 80%. The retail price is $35. What is the wholesale price? SOLUTION Let x represent the wholesale price. Retail price = Wholesale price 100% Markup percent ( + ) = x 100% 80% ( + ) Substitute. 35 = x 180% Add percents. 35 = x 1.8 Write 180% as a decimal. 35

2. Example 4 Finding an Original Amount ≈ x Divide each side by 1.8. 19.44 ANSWER The wholesale price of the lamp is about $19.44.

3. Checkpoint ANSWER about $66.67 4.A store marks up the wholesale price of a printer by 80%. The retail price is $120. What is the wholesale price of the printer?