Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 20,000 units (Dollar, Euro, Pound, etc.), from date: Oct 25, 2017, to date: Nov 25, 2019, namely for a period of 761 days (25 Months), with an annual simple flat interest rate of 2% if the commission fee (withdrawal) is 176%.

Principal (initial amount), P = 20,000


Annual simple interest rate, R = 2%


From date: Oct 25, 2017


To date: Nov 25, 2019


Duration, T = 761 days (25 Months)


Commission fee (withdrawal), F = 176%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(20,000 × 2% × 761) ÷ 365 =


(20,000 × 2 × 761) ÷ (365 × 100) =


30,440,000 ÷ 36,500 =


833.972602739726 ≈


833.97

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

B = P + I =


20,000 + 833.972602739726 =


20,833.972602739726 ≈


20,833.97

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 176%) × 20,833.972602739726 =


- 76% × 20,833.972602739726 ≈


- 15,833.819178082192 ≈


- 15,833.82

Pr = Investment profit:

Pr = D - P =


- 15,833.819178082192 - 20,000 =


- 35,833.819178082192 ≈


- 35,833.82

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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