Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 100 units (Dollar, Euro, Pound, etc.), from date: Jun 9, 930, to date: Jul 9, 2017, namely for a period of 397,049 days (13,045 Months), with an annual simple flat interest rate of 5% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 100


Annual simple interest rate, R = 5%


From date: Jun 9, 930


To date: Jul 9, 2017


Duration, T = 397,049 days (13,045 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(100 × 5% × 397,049) ÷ 365 =


(100 × 5 × 397,049) ÷ (365 × 100) =


198,524,500 ÷ 36,500 ≈


5,439.027397260274 ≈


5,439.03

B = Amount earned:

B = P + I =


100 + 5,439.027397260274 =


5,539.027397260274 ≈


5,539.03

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

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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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