Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 1 units (Dollar, Euro, Pound, etc.), from date: Feb 11, 934, to date: Dec 11, 2018, namely for a period of 396,226 days (13,018 Months), with an annual simple flat interest rate of 0.03% if the commission fee (withdrawal) is 0%.

Principal (initial amount), P = 1


Annual simple interest rate, R = 0.03%


From date: Feb 11, 934


To date: Dec 11, 2018


Duration, T = 396,226 days (13,018 Months)


Commission fee (withdrawal), F = 0%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(1 × 0.03% × 396,226) ÷ 365 =


(1 × 0.03 × 396,226) ÷ (365 × 100) =


11,886.78 ÷ 36,500 ≈


0.325665205479 ≈


0.33

B = Amount earned:

B = P + I =


1 + 0.325665205479 =


1.325665205479 ≈


1.33

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

Writing numbers: comma ',' as thousands separator; point '.' as a decimal mark;

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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