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: Jan 1, 900, to date: Jan 1, 2048, namely for a period of 419,298 days (13,776 Months), with an annual simple flat interest rate of 10% if the commission fee (withdrawal) is 504%.

Principal (initial amount), P = 1


Annual simple interest rate, R = 10%


From date: Jan 1, 900


To date: Jan 1, 2048


Duration, T = 419,298 days (13,776 Months)


Commission fee (withdrawal), F = 504%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(1 × 10% × 419,298) ÷ 365 =


(1 × 10 × 419,298) ÷ (365 × 100) =


4,192,980 ÷ 36,500 ≈


114.876164383562 ≈


114.88

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

B = P + I =


1 + 114.876164383562 =


115.876164383562 ≈


115.88

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 504%) × 115.876164383562 =


- 404% × 115.876164383562 ≈


- 468.13970410959 ≈


- 468.14

Pr = Investment profit:

Pr = D - P =


- 468.13970410959 - 1 =


- 469.13970410959 ≈


- 469.14

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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