Master Wang's loss: a pair of shoes+change =40+ 100-35= 105 (yuan)

The key to solving this kind of problem depends on how much Master Wang finally lost.

Banks confiscate counterfeit money, which has no value, so banks have no profit. After the neighbor started to give a hundred change, Master Wang returned a hundred whole money, so the neighbor didn't make a profit or lose money. The customer bought goods with counterfeit money, and finally took away a pair of shoes (the purchase price was 40) and change (100-35=65), which is the amount of money lost by Master Wang. To sum up, Master Wang lost * * * 105 yuan.

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