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答案是97
礼物成本是18元plus找给年轻人79元 =97
97元
(100回給街坊)+(18成本)
176? id ont know
200.......
His loss is the gain of the young man, which is $79 plus the cost of the gift $ 18, which is , F: w2 h& X8 p+ C9 g5 t/ u
equal to $97.
124 + present
197啦...
97
8 H# D& m" n7 w  y( _1 \/ G9 bi think
97.......................
197...
why dun u give the answer...
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