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, 534, to date: Jan 1, 1, namely for a period of 535,811 days (6,396 Months), with an annual simple flat interest rate of 15% if the commission fee (withdrawal) is 208%.

Principal (initial amount), P = 1


Annual simple interest rate, R = 15%


From date: Jan 1, 534


To date: Jan 1, 1


Duration, T = 535,811 days (6,396 Months)


Commission fee (withdrawal), F = 208%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(1 × 15% × 535,811) ÷ 365 =


(1 × 15 × 535,811) ÷ (365 × 100) =


8,037,165 ÷ 36,500 =


220.196301369863 ≈


220.2

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

B = P + I =


1 + 220.196301369863 =


221.196301369863 ≈


221.2

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 208%) × 221.196301369863 =


- 108% × 221.196301369863 =


- 238.892005479452 ≈


- 238.89

Pr = Investment profit:

Pr = D - P =


- 238.892005479452 - 1 =


- 239.892005479452 ≈


- 239.89

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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