1. First of all, opening a restaurant has a profit algorithm for pre-deposit every day. It is necessary to calculate the deposit in advance. Advance deposit refers to the expenses paid by customers in advance, which can be regarded as the sales of the day.

2. Secondly, pre-deposit billing refers to the expenses paid by customers when they eat. It can be adopted that the customer has used all the pre-deposits, so the pre-deposit account is equal to the sales of the day, that is, the pre-deposit is credited.

3. Finally, the profit calculation of restaurants needs to consider many factors, including cost, labor and rent.