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: Jul 26, 590, to date: Jul 26, 2017, namely for a period of 521,201 days (17,124 Months), with an annual simple flat interest rate of 12% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 100


Annual simple interest rate, R = 12%


From date: Jul 26, 590


To date: Jul 26, 2017


Duration, T = 521,201 days (17,124 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 × 12% × 521,201) ÷ 365 =


(100 × 12 × 521,201) ÷ (365 × 100) =


625,441,200 ÷ 36,500 ≈


17,135.375342465753 ≈


17,135.38

B = Amount earned:

B = P + I =


100 + 17,135.375342465753 =


17,235.375342465753 ≈


17,235.38

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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