【备考每日练】GMAT数学真题精选实例讲解（四十练）

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GMAT备考，除了背背背，更重要的就是练练练!通过练习，巩固知识，熟练技巧，最终才能在GMAT考试中发挥出色，取得好成绩，所以练习的重要性不言而喻。因此，小编为大家精心准备了GMAT考试各类题型的练习题和答案解析，帮助大家每日一练，为考试做好准备。一起来看今天的题目吧。

今日练习题为数学题，题目如下

By what percent was the price of a certain television set discounted for a

sale?

(1) The price of the television set before it was discounted for the sale was

25 percent greater than the discounted price.

(2) The price of the television set was discounted by $60 for the sale.

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 statement TOGETHER are sufficient, but NEITHER statement ALONE is

sufficient.

D EACH statement ALONE is sufficient.

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

正确答案：

A

解题思路：

条件1：题目求的就是百分比, 设原价P 折后价DP， 根据条件(1)可以得出：P=(1+0.25)DP, 所以 DP/P

=0.8。可以算出答案。充分。

条件2：只告诉了折扣具体数值，没有其他数据无从比较，因此无法计算出百分比。不充分。

所以选A。