问题描述：
一道GRE数学题,
At a sale,the cost of each tie was reduced by 20 percent and the cost of each belt was reduced by 30 percent.
比较
The percent reduction on the total cost of 1 tie and 2 belts
和
25%
答案是无法比较.
At a sale,the cost of each tie was reduced by 20 percent and the cost of each belt was reduced by 30 percent.
比较
The percent reduction on the total cost of 1 tie and 2 belts
和
25%
答案是无法比较.
问题解答：
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