Generally, it is for waiters. Waiters divide rooms and tables according to regions. The drinks recommended by themselves or others (foremen and managers) passing by in their own regions are regarded as waiters in charge of the regions. The percentage depends on the percentage between the cost of drinks and the sales price. The percentage is very small, which is based on price and profit. For example, if the price of red wine is between 111 and 211, it will be 3 yuan, and if it is between 211 and 511, it will be 5 yuan.