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: Jan 23, 900, to date: Feb 23, 2017, namely for a period of 408,007 days (13,405 Months), with an annual simple flat interest rate of 3% if the commission fee (withdrawal or payment) is 10%.

Principal (initial amount), P = 100


Annual simple interest rate, R = 3%


From date: Jan 23, 900


To date: Feb 23, 2017


Duration, T = 408,007 days (13,405 Months)


Commission fee (withdrawal or payment), F = 10%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(100 × 3% × 408,007) ÷ 365 =


(100 × 3 × 408,007) ÷ (365 × 100) =


122,402,100 ÷ 36,500 ≈


3,353.482191780822 ≈


3,353.48

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

B = P + I =


100 + 3,353.482191780822 =


3,453.482191780822 ≈


3,453.48

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 10%) × 3,453.482191780822 =


90% × 3,453.482191780822 ≈


3,108.13397260274 ≈


3,108.13

Pr = Investment profit:

Pr = D - P =


3,108.13397260274 - 100 =


3,008.13397260274 ≈


3,008.13

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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