Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 2,000 units (Dollar, Euro, Pound, etc.), from date: Feb 15, 2019, to date: Mar 15, 2019, namely for a period of 28 days, with an annual simple flat interest rate of 33% if the commission fee (withdrawal or payment) is 33%.

Principal (initial amount), P = 2,000


Annual simple interest rate, R = 33%


From date: Feb 15, 2019


To date: Mar 15, 2019


Duration, T = 28 days


Commission fee (withdrawal or payment), F = 33%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(2,000 × 33% × 28) ÷ 365 =


(2,000 × 33 × 28) ÷ (365 × 100) =


1,848,000 ÷ 36,500 ≈


50.630136986301 ≈


50.63

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

B = P + I =


2,000 + 50.630136986301 =


2,050.630136986301 ≈


2,050.63

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 33%) × 2,050.630136986301 =


67% × 2,050.630136986301 ≈


1,373.922191780822 ≈


1,373.92

Pr = Investment profit:

Pr = D - P =


1,373.922191780822 - 2,000 =


- 626.077808219178 ≈


- 626.08

Signs: % percent, ÷ divide, × multiply, ≈ 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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