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: Sep 5, 314, to date: Oct 5, 2019, namely for a period of 622,769 days (20,461 Months), with an annual simple flat interest rate of 780% if the commission fee (withdrawal) is 162%.

Principal (initial amount), P = 1


Annual simple interest rate, R = 780%


From date: Sep 5, 314


To date: Oct 5, 2019


Duration, T = 622,769 days (20,461 Months)


Commission fee (withdrawal), F = 162%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(1 × 780% × 622,769) ÷ 365 =


(1 × 780 × 622,769) ÷ (365 × 100) =


485,759,820 ÷ 36,500 ≈


13,308.488219178082 ≈


13,308.49

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

B = P + I =


1 + 13,308.488219178082 =


13,309.488219178082 ≈


13,309.49

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 162%) × 13,309.488219178082 =


- 62% × 13,309.488219178082 ≈


- 8,251.882695890411 ≈


- 8,251.88

Pr = Investment profit:

Pr = D - P =


- 8,251.882695890411 - 1 =


- 8,252.882695890411 ≈


- 8,252.88

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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