1999 AMC 12 第 5 题

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所有题目均经美国数学协会(MAA)官方合法授权使用。

5.

一本书的标价比建议零售价低 30%30\%。Alice 在五十周年促销中以标价的一半买下这本书。Alice 支付的是建议零售价的百分之几?

The marked price of a book was 30%30\% less than the suggested retail price. Alice purchased the book for half the marked price at a Fiftieth Anniversary sale. What percent of the suggested retail price did Alice pay?

25%25\%

30%30\%

35%35\%

60%60\%

65%65\%

答案:C
知识点:百分数
难度评级:960
解答:

若建议零售价为 PP 则标价为 0.7P0.7P。Alice 支付其中一半,即 0.35P0.35P 也就是建议零售价的 35%35\%

所以正确答案是 C

If the suggested retail price is P,P, then the marked price is 0.7P.0.7P. Alice pays half of this, 0.35P,0.35P, which is 35%35\% of the suggested retail price.

Thus, the correct answer is C.

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