This is related to the number of people who eat every day; There are two critical points for the number of diners, the maximum and the minimum, with the minimum being 0. The maximum is related to the dining rate (generally, the maximum dining rate is 400%, and only fast food restaurants have this dining rate) and the total number of seats. When the number of diners is at least 0, the gas expenditure is also the smallest (only the gas processed by raw materials accounts for 50%-60% of the total gas in general Chinese food), and when the number of diners is the largest, the gas expenditure is also very large; If the restaurant uses the catering ordering system, these data are very easy to get;