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  3. What was the original price of an item if a discount of 20 percent reduced the price to $100?

What was the original price of an item if a discount of 20 percent reduced the price to $100?

admin2009-05-19  36
问题 What was the original price of an item if a discount of 20 percent reduced the price to $100?
选项 A、$80
B、$120
C、$125
D、$150
E、$250
答案C
解析 若一商品打折(discount)20％后价钱降到$100，那么它原来的价钱是多少?
解：本题的正确答案为(C)。“a discount of 20 percent”表示打折20％，设该商品原价为x，则有：x(1-20%)=$100  so, x=$125
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