I have never known the answer to a question, so I'm here to ask. Xiao Wang sells shoes. The purchase price of a pair of shoes is 3 yuan, and the sale price is 2 yuan. The customer bought shoes and gav

I have never known the answer to a question, so I'm here to ask. Xiao Wang sells shoes. The purchase price of a pair of shoes is 3 yuan, and the sale price is 2 yuan. The customer bought shoes and gave them 5 yuan. 3-2+5=6 The purchase price of 3 sold 2 and lost 1 yuan. Because the 5 exchanged with the neighbor included the change of 3, only one 5 was lost.

You can also count it as shoes from Xiao Wang -3 for shoes +2 for money without loss to compensate the neighbor -5. -3+2-5=-6