1. Formula for calculating the gross profit rate of dishes: gross profit rate = gross profit/selling price * 100%, = (selling price-cost)/selling price *100%; Among them, the cost is the sum of the prices of various raw materials and fuels. Contains the main ingredients, ingredients and seasonings of dishes. In the main ingredients, it is also necessary to calculate the net rate of raw materials and the output of cooked products.

2. Gross profit margin is the percentage of gross profit and sales income (or operating income), where gross profit is the difference between income and operating cost corresponding to income. Gross profit margin reflects the value-added part of a commodity after its production is transformed into an internal system. In other words, the more value added, the more gross profit.

3. Gross profit margin is divided into gross profit margin of product sales of industrial enterprises by industry; Gross profit margin of tourism catering service industry; Gross profit margin of commodity sales of commercial enterprises; Gross profit margin of construction enterprises; Gross profit margin of transportation industry. The calculation formula is: gross profit margin = (sales revenue-sales cost)/sales revenue × 100%.

4. Gross profit margin will be affected by many factors, including market competition, enterprise marketing, R&D cost, brand effect, fixed cost, technology cost, process flow, turnover rate, life cycle, product parts and so on. Fixed cost refers to the investment in fixed assets that constitute fixed manufacturing expenses, such as machinery and equipment, factory buildings and factory rents.