Under the condition that the selling price of the product remains unchanged, the amount of profit is affected by the cost of the product and the structure of the product. Product costs are reduced, the proportion of products with high profit margins in the product structure increases, and the sales profit margin increases; "Conversely, as the cost of products rises and the proportion of products with high profit margins in the product structure decreases, the profit margin for sales decreases." Analysis, assessment of net sales interest rate, to improve the product structure, promote cost reduction and so on have a positive role.
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