一天,有个年轻人来到童鞋店里买了一双鞋子。这双鞋子的成本是15元,标价是21元。这个年轻人掏出50元要买这双鞋子。童鞋店老板当时没有零钱,用那50元向街坊换了50元的零钱,找给年轻人29元。但是街坊后来发现那50元是假钞,童鞋店老板无奈之下,又还给街坊50元。现在的问题是:童鞋店在这次交易中到底损失了多少钱?A.15B.44C.50 One day, a young man came to a children’s shoe store and bought a pair of shoes. The cost of these shoes is 15 yuan, the price is 21 yuan. The young man took out 50 yuan to buy these shoes. Child shoe store owner did not change at that time, with 50 yuan to the neighborhood for 50 yuan change, find young people 29 yuan. However, the neighborhood later discovered that 50 yuan is a fake note, children shoe shop owner desperation, but also to the neighborhood 50 yuan. The question now is: How much does the shoe store lose in this transaction? A.15B.44C.50