Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 20,000 units (Dollar, Euro, Pound, etc.), from date: Jul 1, 2012, to date: Jul 1, 2017, namely for a period of 1,826 days (60 Months), with an annual simple flat interest rate of 9% if the commission fee (withdrawal or payment) is 3%.

Principal (initial amount), P = 20,000


Annual simple interest rate, R = 9%


From date: Jul 1, 2012


To date: Jul 1, 2017


Duration, T = 1,826 days (60 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(20,000 × 9% × 1,826) ÷ 365 =


(20,000 × 9 × 1,826) ÷ (365 × 100) =


328,680,000 ÷ 36,500 =


9,004.931506849315 ≈


9,004.93

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

B = P + I =


20,000 + 9,004.931506849315 =


29,004.931506849315 ≈


29,004.93

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 3%) × 29,004.931506849315 =


97% × 29,004.931506849315 ≈


28,134.783561643836 ≈


28,134.78

Pr = Investment profit:

Pr = D - P =


28,134.783561643836 - 20,000 =


8,134.783561643836 ≈


8,134.78

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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