The mathematics of selling and buying goods.

One shoe is 45, and that pair is bought in 90 yuan and sold for 60.

The cost to customers, 90 yuan purchase+change 40 yuan, the loss in this process is *** 130 yuan.

The remaining 60 yuan +40 yuan was returned to the neighboring store, and 60 yuan was from the neighboring store. He wanted to leave 40 yuan himself, so he lost 40 yuan in the process.

Finally, it should be a loss 170 yuan.

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