This is a math problem that can measure a person's business acumen. Master Wang sells shoes. A pair of shoes costs 30 yuan, and a customer bought a pair of shoes for 50 yuan. Master Wang had no change, so he asked his neighbor to change 50 yuan. Afterwards, the neighbors found out that the money was fake, and Master Wang paid 50 yuan back to the neighbors. How much did Master Wang lose? This question is not simple. How much did you lose? This is a question done in a group of 100 people. Only two people got it right in half an hour. Let's have a try. )

Master Wang Xie lost 60 yuan.

This 60 yuan is the shoe price of 30+ customer 30 yuan.

Pay attention to the relationship between Master Wang and his neighbor, because the neighbor gave Master Wang 50 yuan and Master Wang gave it to his neighbor 50 yuan.