GWD21-21

meckychen

Q21:

A store purchased a Brand C computer for the same amount that it paid for a Brand D computer and then sold them both at higher prices.  The store’s gross profit on the Brand C
computer was what percent greater than its gross profit on the Brand D computer?
(1)   The price at which the store sold the Brand C computer was 15 percent greater than the price at which the store sold the Brand D computer.

(2)     The store’s gross profit on the Brand D computer was $300.

Answer is E , how to understand?Thanks

a10285

求的是D、C毛利润的比例，（C-D）/C
（1）只知(C-D)的百分比，不知D百分比  不能确认
（2）只知D，不知C    不能确认
（1）+（2）D和 C,D百分比 不是一个概念，  不能确认

选E

meckychen

thanks