Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 4,000 units (Dollar, Euro, Pound, etc.), from date: Sep 26, 2017, to date: Sep 26, 2020, namely for a period of 1,096 days (36 Months), with an annual simple flat interest rate of 2% if the commission fee (withdrawal) is 2%.

Principal (initial amount), P = 4,000


Annual simple interest rate, R = 2%


From date: Sep 26, 2017


To date: Sep 26, 2020


Duration, T = 1,096 days (36 Months)


Commission fee (withdrawal), F = 2%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(4,000 × 2% × 1,096) ÷ 365 =


(4,000 × 2 × 1,096) ÷ (365 × 100) =


8,768,000 ÷ 36,500 ≈


240.219178082192 ≈


240.22

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

B = P + I =


4,000 + 240.219178082192 =


4,240.219178082192 ≈


4,240.22

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 2%) × 4,240.219178082192 =


98% × 4,240.219178082192 ≈


4,155.414794520548 ≈


4,155.41

Pr = Investment profit:

Pr = D - P =


4,155.414794520548 - 4,000 =


155.414794520548 ≈


155.41

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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