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【OG20-P283-344题】
By what percentage 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.
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题干:假设原价是p,打折后价格是x,能求出x/p即可
条件1:p=(1+25%)x,充分
条件2:p-x=60,不充分
题目讨论 (1条评论)

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阿云龙
原始售价X,折后售价Y,求(X-Y)/X 1)X=1.25Y (X-Y)/X=0.25/1.25=20% sufficient 2)Y=X-60 60/X无法得出答案 not sufficient
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0 回复 2019-09-12 23:03:11