Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 10,000 units (Dollar, Euro, Pound, etc.), from date: Apr 19, 408, to date: Mar 19, 2017, namely for a period of 587,644 days (19,307 Months), with an annual simple flat interest rate of 10% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 10,000


Annual simple interest rate, R = 10%


From date: Apr 19, 408


To date: Mar 19, 2017


Duration, T = 587,644 days (19,307 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(10,000 × 10% × 587,644) ÷ 365 =


(10,000 × 10 × 587,644) ÷ (365 × 100) =


58,764,400,000 ÷ 36,500 ≈


1,609,983.561643835616 ≈


1,609,983.56

B = Amount earned:

B = P + I =


10,000 + 1,609,983.561643835616 =


1,619,983.561643835616 ≈


1,619,983.56

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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