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怎么算？

2015-09-21 11:43:23| 分类：百家争鸣 | 标签： |举报 |字号大中小订阅

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有3个人去投宿，一晚三十元.三个人每人掏了10元凑够三十元交给了老板。

后来老板说今天优惠只要25元就够了,拿出5元命令服务生退还给他们, 服务生偷偷藏起了2元, 然后,把剩下的3元钱分给了那三个人,每人分到1元。

这样,一开始每人掏了10元,现在又退回1元,也就是10-1=9,每人只花了9元钱, 3个人每人9元,3 X 9 = 27 元 + 服务生藏起的2元=29元，还有一元钱去了哪里？

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