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Your calculation should be wrong. As Mr. Wong need to refund $100 to his neighbour. The calculation should be : 8 Y: M4 Z, q6 H: u* B, mTVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。$100 (refund to neighbour from Mr Wong's own money) + $79 (paid to the young man) - $3 (earning from the sale) = $176 8 I# w# G; e/ Y3 b8 n& I" |- r$ \This should be the fact.