Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 400,000 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: Mar 25, 2012, to date: Mar 25, 2022, namely for a period of 3,652 days (120 Months), with an annual simple flat interest rate of 7.5% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 400,000


Annual simple interest rate, R = 7.5%


From date: Mar 25, 2012


To date: Mar 25, 2022


Duration, T = 3,652 days (120 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(400,000 × 7.5% × 3,652) ÷ 365 =


(400,000 × 7.5 × 3,652) ÷ (365 × 100) =


10,956,000,000 ÷ 36,500 ≈


300,164.383561643836 ≈


300,164.38

B = Amount earned:

B = P + I =


400,000 + 300,164.383561643836 =


700,164.383561643836 ≈


700,164.38

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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