Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 1,300 units (Dollar, Euro, Pound, etc.), from date: Aug 13, 2013, to date: Dec 30, 2016, namely for a period of 1,235 days (40 Months and 17 Days), with an annual simple flat interest rate of 8% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 1,300


Annual simple interest rate, R = 8%


From date: Aug 13, 2013


To date: Dec 30, 2016


Duration, T = 1,235 days (40 Months and 17 Days)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(1,300 × 8% × 1,235) ÷ 365 =


(1,300 × 8 × 1,235) ÷ (365 × 100) =


12,844,000 ÷ 36,500 ≈


351.890410958904 ≈


351.89

B = Amount earned:

B = P + I =


1,300 + 351.890410958904 =


1,651.890410958904 ≈


1,651.89

Signs: % percent, ÷ divide, × multiply, = equal, ≈ 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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