Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 1,854 units (Dollar, Euro, Pound, etc.), from date: Sep 30, 226, to date: Jun 15, 2010, namely for a period of 651,486 days (21,405 Months without 15 Days), with an annual simple flat interest rate of 7.2% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 1,854


Annual simple interest rate, R = 7.2%


From date: Sep 30, 226


To date: Jun 15, 2010


Duration, T = 651,486 days (21,405 Months without 15 Days)


Commission fee (withdrawal or payment), F = 0%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(1,854 × 7.2% × 651,486) ÷ 365 =


(1,854 × 7.2 × 651,486) ÷ (365 × 100) =


8,696,556,316.8 ÷ 36,500 ≈


238,261.816898630137 ≈


238,261.82

B = Amount earned:

B = P + I =


1,854 + 238,261.816898630137 =


240,115.816898630137 ≈


240,115.82

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Calculate simple flat rate interest on a principal borrowed, lent

Simple flat rate interest = (Principal × Annual simple flat interest rate × Duration in days) ÷ Number of days in a year

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