A young man was in a toy store and wanted to buy a water gun worth 23 yuan. He took out a piece of 100 yuan, but the shopkeeper couldn't get it back, so he went to the fruit shop to change the change, and gave the young man 77 yuan. After the young man left, the person from the fruit shop came to the person in the toy store and said, "This 100 yuan is fake." Please help the person in the toy store think about it, how much did he lose?
一位年轻人在玩具店，要买一支价值23元的水枪，他拿出一张100元的钱，店主找不开，就到水果店去兑换零钱，找给年轻人77元．年轻人走后，水果店的人来找玩具店的人说："这100元是假的"请你帮玩具店的人想一想，他赔了多少钱？
<gadget id="calculator">23 + 77</gadget>
<output>100</output>

<result>100</result>