what you want to ask is how to calculate the loss rate of catering.

reported loss rate of catering = broken quantity (number of pieces)/statistical total quantity (total number of pieces) *111%.

The tableware breakage rate refers to the ratio of the expenses incurred due to breakage and scrapping of tableware in use to the total amount of tableware used. Usually, the natural loss rate of tableware is three thousandths, that is, three thousandths of the operating income of the catering department in that month. Natural loss does not include the amount of compensation for customers and employees. In order to prevent the occurrence of hidden reports of damaged tableware, we can adhere to the principle of "whoever breaks it is responsible, and no one is responsible for sharing it again". In the selection of tableware, besides the collocation and beauty of tableware and dishes, we should also consider the convenience of washing, and try to avoid using special-shaped plates. If special-shaped plates or glass plates must be used, they must be washed separately to reduce the loss.