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 25, 732, to date: Mar 25, 2017, namely for a period of 469,306 days (15,419 Months), with an annual simple flat interest rate of 3% if the commission fee (withdrawal or payment) is 3%.

Principal (initial amount), P = 100


Annual simple interest rate, R = 3%


From date: Apr 25, 732


To date: Mar 25, 2017


Duration, T = 469,306 days (15,419 Months)


Commission fee (withdrawal or payment), F = 3%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(100 × 3% × 469,306) ÷ 365 =


(100 × 3 × 469,306) ÷ (365 × 100) =


140,791,800 ÷ 36,500 ≈


3,857.309589041096 ≈


3,857.31

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

B = P + I =


100 + 3,857.309589041096 =


3,957.309589041096 ≈


3,957.31

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 3%) × 3,957.309589041096 =


97% × 3,957.309589041096 ≈


3,838.590301369863 ≈


3,838.59

Pr = Investment profit:

Pr = D - P =


3,838.590301369863 - 100 =


3,738.590301369863 ≈


3,738.59

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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