Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 5,000 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: Jun 6, 2017, to date: Jul 6, 2018, namely for a period of 395 days (13 Months), with an annual simple flat interest rate of 2% if the commission fee (withdrawal or payment) is 17%.

Principal (initial amount), P = 5,000


Annual simple interest rate, R = 2%


From date: Jun 6, 2017


To date: Jul 6, 2018


Duration, T = 395 days (13 Months)


Commission fee (withdrawal or payment), F = 17%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(5,000 × 2% × 395) ÷ 365 =


(5,000 × 2 × 395) ÷ (365 × 100) =


3,950,000 ÷ 36,500 ≈


108.219178082192 ≈


108.22

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

B = P + I =


5,000 + 108.219178082192 =


5,108.219178082192 ≈


5,108.22

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 17%) × 5,108.219178082192 =


83% × 5,108.219178082192 ≈


4,239.821917808219 ≈


4,239.82

Pr = Investment profit:

Pr = D - P =


4,239.821917808219 - 5,000 =


- 760.178082191781 ≈


- 760.18

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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