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, 936, to date: Mar 8, 2018, namely for a period of 395,218 days (12,985 Months without 3 Days), 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: Feb 11, 936


To date: Mar 8, 2018


Duration, T = 395,218 days (12,985 Months without 3 Days)


Commission fee (withdrawal), F = 504%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(1 × 0.03% × 395,218) ÷ 365 =


(1 × 0.03 × 395,218) ÷ (365 × 100) =


11,856.54 ÷ 36,500 ≈


0.324836712329 ≈


0.32

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

B = P + I =


1 + 0.324836712329 =


1.324836712329 ≈


1.32

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 504%) × 1.324836712329 =


- 404% × 1.324836712329 ≈


- 5.352340317809 ≈


- 5.35

Pr = Investment profit:

Pr = D - P =


- 5.352340317809 - 1 =


- 6.352340317809 ≈


- 6.35

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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