Monday, September 13, 2010

一元哪去了(请告诉我)

Posted by CeCy Lau at 3:16 AM
Labels: ,
一天，3人去住店，房费30元，每人分别付10元。
老板拿钱后对伙计说优惠他们5元。但是伙计只退了他们每人1元，自己拿走了2元，(相当于每人出了9元)。
那么每人出了9元，3*9=27元，在加上伙计拿走的2元(27+2=29元)
那一元哪去了？？？

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