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The answer to the math problem of selling fish
Master Wang and his neighbors do not make money or lose money.

So don't think about it. It's much easier.

Considering the actual loss of Master Wang:

(1) Purchase price of one kilogram (two Jin) of fish:

45×2=90 (yuan)

2 for customers.

100-35=65 (yuan)

Therefore, the actual loss of Master Wang is:

90+65= 155 (yuan)