Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 12,400 units (Dollar, Euro, Pound, etc.), from date: Dec 18, 2017, to date: Jan 18, 2018, namely for a period of 31 days, with an annual simple flat interest rate of 25% if the commission fee (withdrawal or payment) is 25%.

Principal (initial amount), P = 12,400


Annual simple interest rate, R = 25%


From date: Dec 18, 2017


To date: Jan 18, 2018


Duration, T = 31 days


Commission fee (withdrawal or payment), F = 25%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(12,400 × 25% × 31) ÷ 365 =


(12,400 × 25 × 31) ÷ (365 × 100) =


9,610,000 ÷ 36,500 ≈


263.287671232877 ≈


263.29

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

B = P + I =


12,400 + 263.287671232877 =


12,663.287671232877 ≈


12,663.29

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 25%) × 12,663.287671232877 =


75% × 12,663.287671232877 ≈


9,497.465753424658 ≈


9,497.47

Pr = Investment profit:

Pr = D - P =


9,497.465753424658 - 12,400 =


- 2,902.534246575342 ≈


- 2,902.53

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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