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, 186, to date: Mar 11, 2018, namely for a period of 669,152 days (21,985 Months), with an annual simple flat interest rate of 0.03% if the commission fee (withdrawal) is 488%.

Principal (initial amount), P = 1


Annual simple interest rate, R = 0.03%


From date: Feb 11, 186


To date: Mar 11, 2018


Duration, T = 669,152 days (21,985 Months)


Commission fee (withdrawal), F = 488%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(1 × 0.03% × 669,152) ÷ 365 =


(1 × 0.03 × 669,152) ÷ (365 × 100) =


20,074.56 ÷ 36,500 ≈


0.549987945205 ≈


0.55

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

B = P + I =


1 + 0.549987945205 =


1.549987945205 ≈


1.55

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 488%) × 1.549987945205 =


- 388% × 1.549987945205 ≈


- 6.013953227395 ≈


- 6.01

Pr = Investment profit:

Pr = D - P =


- 6.013953227395 - 1 =


- 7.013953227395 ≈


- 7.01

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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