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: May 12, 504, to date: Apr 12, 2017, namely for a period of 552,582 days (18,155 Months), with an annual simple flat interest rate of 3% if the commission fee (withdrawal or payment) is 2%.

Principal (initial amount), P = 100


Annual simple interest rate, R = 3%


From date: May 12, 504


To date: Apr 12, 2017


Duration, T = 552,582 days (18,155 Months)


Commission fee (withdrawal or payment), F = 2%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(100 × 3% × 552,582) ÷ 365 =


(100 × 3 × 552,582) ÷ (365 × 100) =


165,774,600 ÷ 36,500 ≈


4,541.769863013699 ≈


4,541.77

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

B = P + I =


100 + 4,541.769863013699 =


4,641.769863013699 ≈


4,641.77

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 2%) × 4,641.769863013699 =


98% × 4,641.769863013699 =


4,548.934465753425 ≈


4,548.93

Pr = Investment profit:

Pr = D - P =


4,548.934465753425 - 100 =


4,448.934465753425 ≈


4,448.93

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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