What is the calculation formula of property management fee?

In practice, there are two methods to calculate late fees, which can be applied:

1. For the convenience of operation, we can convert the daily late payment fee into the monthly late payment fee, that is, three thousandths of 30 days, 0.003×30=0.09. As the membership fee is paid every month, it is a continuous and dynamic algorithm, which seems troublesome, but it is actually regular, and it is a typical arithmetic progression in mathematics. The formula of the sum of the first n items in arithmetic progression is sn=n(a 1+an)/2, where sn is the overdue fine payable, n is the number of months in arrears, a 1 is the overdue fine in the first month in arrears, an is the overdue fine in the last month in arrears, a 1=0.09nf, and an = 0.

0.045fn(n+ 1). In fact, the overdue days may exceed the whole period. In order to count the overdue days, this formula can be improved accordingly: sn=

0.045fn (n+1)+0.003f (n+1) × t, where t is the number of days beyond the deadline.

The key to the formula is the selection of n, because the formula is derived from series, so the number of n must meet the conditions of series, that is, the number of n must be calculated according to the term. For example, the management fee of a household is 48 yuan, and the arrears start from April 1998. Assuming that the payment period of the defaulting household is 1999 65438+ 10/9, then n should be 8, and it is wrong to take 9, because1999 has been paid. The calculation method of overdue fine for this household is: 0.0045× 48× 8 (8+1)+0.003× 48 (8+1)×19 =180.14 yuan. If someone is troubled by the choice of n, they can also choose n as the number of months in arrears, and the formula can be changed to: 0.045 fn (n-1)+0.003 fnt; For the above defaulting households, n is 9, and the overdue fine payable is 0.045× 48× 9 (9-1)+0.003× 40. In addition, if the management fee is adjusted during the arrears period, you can use this formula to calculate the increased part after adjusting the management fee plus the original calculated figure.

Second, the late payment fee s=kn×0.003×t, that is, the late payment fee s= monthly management fee (k)× the number of months in arrears (n)×0.003 (coefficient )× the average daily time in arrears (t). The above formula is intuitive and easy to operate. When billing, the original data can be fully retained, so that the operator can see it at a glance, and it is also very convenient to determine T. If a household is in arrears for n months and settles on A day (calculated as 30 days per month), then t=(n- 1)/2×30+a day. For the convenience of operation, we can also know the late payment fee S = KN× 0.003× [(n-1)/2× 30+A], where A is the date of the settlement month. For example, the management fee of a household is 80 yuan/month, which is owed from August 1998 to 1 month10,999, and the late payment fee is s=

80× 5× 0.003× [(5-1)/2× 30+10] = 84 yuan. When issuing late payment bills, the calculation of t should be omitted, that is, the column of invoice collection items can be written as 80×5×0.003×70. Similarly, if the arrears are adjusted in the middle, the above formula is also applicable, and the management fee difference is a positive late fee, and a negative one is negative.