How to calculate the dosage of hotel dental appliances for 1-3 months?

Let me answer this, after all, it is tourism management. First of all, please estimate the time. Different three months of the year are different. For example, the three months before and after the Spring Festival are off-season, two months before and after May Day, and before and after National Day. Naturally, the usage will be different depending on the customer traffic. Then determine how many rooms your hotel has, how many dental appliances per room per day, and then use the front desk's previous accounts to calculate how many rooms are needed in a month. Or I can tell you a simple method. For example, if you purchase dental appliances once a month, calculate your maximum usage of dental appliances this month, that is, if the customers are full every day, purchase according to this, record the usage, and the next month's purchase can be replenished to the amount you wrote down. Just use the maximum quantity. Look at me coding so many words, give me some points.