Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 100 units (Dollar, Euro, Pound, etc.), from date: Apr 13, 2018, to date: May 13, 2018, namely for a period of 30 days, with an annual simple flat interest rate of 20% if the commission fee (withdrawal or payment) is 40%.

Principal (initial amount), P = 100


Annual simple interest rate, R = 20%


From date: Apr 13, 2018


To date: May 13, 2018


Duration, T = 30 days


Commission fee (withdrawal or payment), F = 40%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(100 × 20% × 30) ÷ 365 =


(100 × 20 × 30) ÷ (365 × 100) =


60,000 ÷ 36,500 ≈


1.643835616438 ≈


1.64

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

B = P + I =


100 + 1.643835616438 =


101.643835616438 ≈


101.64

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 40%) × 101.643835616438 =


60% × 101.643835616438 ≈


60.986301369863 ≈


60.99

Pr = Investment profit:

Pr = D - P =


60.986301369863 - 100 =


- 39.013698630137 ≈


- 39.01

Signs: % percent, ÷ divide, × multiply, = equal, ≈ 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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