數學問題一則

一日,有個年輕人去童鞋店里買了對波鞋。這對鞋子成本是15元,標價是21元。结果是這個年輕人掏出50元要買這鞋子。鞋店當時沒有散錢,後來用那年輕人付的50元向街坊换了50元的散錢,找给年輕人29元。但是街坊後來發現那50 元是假鈔,鞋店無奈之下,還了街坊50元。 現在問題是:鞋店在這次交易中到底損失了多少錢 ?

Highlight 後便可顯示答案:
44

Spec thx: 珍珍

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