2006 AMC 12B 第 4 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。
4.
Mary 准备在杂货店为五件商品付款。这些商品的价格分别为 ，，，，和 。Mary 将用一张二十美元的纸币付款。她收到的找零约占 的百分之几？
Mary is about to pay for five items at the grocery store. The prices of the items are and Mary will pay with a twenty-dollar bill. Which of the following is closest to the percentage of the that she will receive in change?
小提示：
把每个价格四舍五入到最接近的美元，快速估计总价
Round each price to the nearest dollar to estimate the total quickly
大提示：
找零是 减去总价；把它与 比较成分数
The change is minus the total; compare it to as a fraction
解答：
商品价格总计 ，所以找零为 。它占 的百分比为 最接近的选项是 。
所以正确答案是 A。
The prices total so the change is As a percentage of this is The closest listed percentage is
Thus, the correct answer is A.
其他年份的第 4 题
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