Every once in a while, there is this problem.

During the transaction, Master Zhao lost the cost of buying shoes, 40 yuan, and paid it to customer 65 yuan, so Master Zhao lost 40+65= 105 yuan.

Customer profit 105 yuan;

There is nothing wrong with his neighbor, he just plays soy sauce, because in the end he didn't lose money or make money. He's just a distraction.

The answer is simple: he lost 105 yuan.