How is the price of cooked food calculated?

If we plan to sell a single product at the price of 15 yuan and hope to achieve a gross profit margin of 20%, what is the highest product cost we can accept? (Assuming that both input tax and output tax are 13%)

Single product cost price: single product price *( 1- single product gross profit rate%)

Similarly, when using this formula, either all the prices excluding tax or all the prices including tax are used, and pay attention to the differences between tax rates.

Purchase price of single product:15 * (1-20%) =12 RMB.

Pre-tax cost price of a single product:12/1.13 =10.62 RMB.