Warehouse W’s revenue from the sale of sofas was what percent greater this year than it was last year?

Warehouse W’s revenue from the sale of sofas was what percent greater this year than it was last year? GMAT Explanation.

(1) Warehouse W sold 10% more sofas this year than it did last year
(2) Warehouse W’s selling price per sofa was $30 greater this year than it was last year

Correct Answer: E