Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 100 units (Dollar, Euro, Pound, etc.), from date: Apr 5, 398, to date: May 5, 2017, namely for a period of 591,358 days (19,429 Months), with an annual simple flat interest rate of 3% if the commission fee (withdrawal or payment) is 0.04%.

Principal (initial amount), P = 100


Annual simple interest rate, R = 3%


From date: Apr 5, 398


To date: May 5, 2017


Duration, T = 591,358 days (19,429 Months)


Commission fee (withdrawal or payment), F = 0.04%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(100 × 3% × 591,358) ÷ 365 =


(100 × 3 × 591,358) ÷ (365 × 100) =


177,407,400 ÷ 36,500 ≈


4,860.476712328767 ≈


4,860.48

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

B = P + I =


100 + 4,860.476712328767 =


4,960.476712328767 ≈


4,960.48

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 0.04%) × 4,960.476712328767 =


99.96% × 4,960.476712328767 ≈


4,958.492521643835 ≈


4,958.49

Pr = Investment profit:

Pr = D - P =


4,958.492521643835 - 100 =


4,858.492521643835 ≈


4,858.49

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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