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Cost performance ratio is the ratio of performance value to price value of goods. It is a quantitative measurement method to reflect the degree of purchasability of goods. The full name of cost performance ratio is the performance price ratio, which is a proportional relationship between performance and price. The specific formula is: cost performance = performance / price. There are usually no comparisons based on the same performance or fewer opportunities for comparison. Cost performance should be based on your product performance requirements, that is, meet the performance requirements first, and then talk about whether the price is appropriate. Because cost performance is a proportional relationship, it has its scope of application and particularity, which can not be generalized.