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。
