Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 1,000 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: Feb 13, 2017, to date: Mar 13, 2117, namely for a period of 36,552 days (1,201 Months), with an annual simple flat interest rate of 5% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 1,000


Annual simple interest rate, R = 5%


From date: Feb 13, 2017


To date: Mar 13, 2117


Duration, T = 36,552 days (1,201 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(1,000 × 5% × 36,552) ÷ 365 =


(1,000 × 5 × 36,552) ÷ (365 × 100) =


182,760,000 ÷ 36,500 ≈


5,007.123287671233 ≈


5,007.12

B = Amount earned:

B = P + I =


1,000 + 5,007.123287671233 =


6,007.123287671233 ≈


6,007.12

Signs: % percent, ÷ divide, × multiply, ≈ approximately equal;

Writing numbers: comma ',' as thousands separator; point '.' as a decimal mark;

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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