Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 4,000 units (Dollar, Euro, Pound, etc.), from date: Jul 11, 2017, to date: Aug 10, 2017, namely for a period of 30 days, with an annual simple flat interest rate of 3% if the commission fee (withdrawal or payment) is 1%.

Principal (initial amount), P = 4,000


Annual simple interest rate, R = 3%


From date: Jul 11, 2017


To date: Aug 10, 2017


Duration, T = 30 days


Commission fee (withdrawal or payment), F = 1%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(4,000 × 3% × 30) ÷ 365 =


(4,000 × 3 × 30) ÷ (365 × 100) =


360,000 ÷ 36,500 ≈


9.86301369863 ≈


9.86

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

B = P + I =


4,000 + 9.86301369863 =


4,009.86301369863 ≈


4,009.86

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 1%) × 4,009.86301369863 =


99% × 4,009.86301369863 ≈


3,969.764383561644 ≈


3,969.76

Pr = Investment profit:

Pr = D - P =


3,969.764383561644 - 4,000 =


- 30.235616438356 ≈


- 30.24

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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