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: Oct 12, 2018, to date: Nov 12, 2018, namely for a period of 31 days, with an annual simple flat interest rate of 2% if the commission fee (withdrawal or payment) is 1%.

Principal (initial amount), P = 4,000


Annual simple interest rate, R = 2%


From date: Oct 12, 2018


To date: Nov 12, 2018


Duration, T = 31 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 × 2% × 31) ÷ 365 =


(4,000 × 2 × 31) ÷ (365 × 100) =


248,000 ÷ 36,500 ≈


6.794520547945 ≈


6.79

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

B = P + I =


4,000 + 6.794520547945 =


4,006.794520547945 ≈


4,006.79

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 1%) × 4,006.794520547945 =


99% × 4,006.794520547945 ≈


3,966.726575342466 ≈


3,966.73

Pr = Investment profit:

Pr = D - P =


3,966.726575342466 - 4,000 =


- 33.273424657534 ≈


- 33.27

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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