gwd2－Q9:

What was the price at which a merchant sold a certain appliance?

(1)   The merchant’s gross profit on the appliance was 20 percent of the price at which the merchant sold the appliance.

(2)   The price at which the merchant sold the appliance was $50 more than the merchant’s cost of the appliance.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

答案选c。各位是怎么做的？

First you must have a strong  sense of the relationship of the 3 variable.

"gross profit "means 利润

 "the sold price "means 售价

"the cost"means 成本

他们的关系是利润=售价-成本，so let the sold price to be x ,you can make the

equation    x-50=80%x  ,x=100