Formula for the number of days of stay in dormitory public facilities.

Total utility = unit utility × occupied days.

According to the specific charging method and occupancy situation, the calculation formula of the number of days of dormitory public facilities can be different. The following is a commonly used calculation formula: total water and electricity cost = unit water and electricity cost × occupancy days, where unit water and electricity cost refers to the price of water and electricity cost per unit time (usually every day) and occupancy days refers to the actual occupancy days in the billing period. For example, the unit water and electricity fee 10 yuan/day, and the occupancy days are 30 days, then the total water and electricity fee = 10 yuan/day ×30 days =300 yuan.

It should be noted that this formula is only applicable to the case of daily billing. If the water and electricity charges are collected monthly or by other means, it needs to be adjusted according to the actual situation.