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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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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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2019-09-12 23:03:11
