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: Mar 11, 822, to date: Feb 11, 2018, namely for a period of 436,802 days (14,351 Months), with an annual simple flat interest rate of 0.03% if the commission fee (withdrawal) is 504%.

Principal (initial amount), P = 1


Annual simple interest rate, R = 0.03%


From date: Mar 11, 822


To date: Feb 11, 2018


Duration, T = 436,802 days (14,351 Months)


Commission fee (withdrawal), F = 504%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(1 × 0.03% × 436,802) ÷ 365 =


(1 × 0.03 × 436,802) ÷ (365 × 100) =


13,104.06 ÷ 36,500 ≈


0.359015342466 ≈


0.36

B = Amount earned before deducting the
commission fee (withdrawal):

B = P + I =


1 + 0.359015342466 =


1.359015342466 ≈


1.36

D = Amount earned after deducting the
commission fee (withdrawal):

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 504%) × 1.359015342466 =


- 404% × 1.359015342466 ≈


- 5.490421983563 ≈


- 5.49

Pr = Investment profit:

Pr = D - P =


- 5.490421983563 - 1 =


- 6.490421983563 ≈


- 6.49

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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