analyse

A shoe 40 yuan, a pair of shoes 80 yuan,

Sold to the customer 35 yuan, (it should be a loss of 80-35=45 yuan).

100 yuan for fake money 100-35=65 yuan, that is, the customer got 65 yuan again.

As for Master Wang, he took the neighbor 100 yuan and gave it back to the neighbor 100 yuan. As a result, the counterfeit money equivalent to Master Wang 100 yuan was confiscated.

calculate

Method 1. Income from customers: a pair of shoes, money from 80 yuan and 65 yuan.

(40× 2)+(100-35) =145 (yuan)

Method two. Judging from the loss of Master Wang, we should have lost 45 yuan, counterfeit money 100 yuan.

(40×2-35)+ 100= 145 (yuan)

Original title

Master Wang sells shoes. A shoe was bought by 40 yuan. Now customers come to 35 yuan to buy a pair of shoes and sell them at a loss, giving Master Wang fake money 100 yuan. Master Wang had no change, so he asked his neighbor to change it 100 yuan. Afterwards, neighbors found that the money was fake during the process of saving money, and it was confiscated by the bank. Master Wang also lost 100 to his neighbor. How much did Master Wang lose?