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Clothing factories set prices for each process. What is the reasonable price?

Clothing factory will only give you the finished price of the whole accessories, such as pants processing fee 12 yuan. As for the price of each process, it is set by a processing factory for the workers in the processing factory. For example, the zipper on the pants is 50 points and the waist is 60 points. The sum of the prices of all processes is lower than the price set by the garment factory, which is your gross profit.