Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 464 units (Dollar, Euro, Pound, etc.), from date: Sep 1, 2018, to date: Sep 4, 2018, namely for a period of 3 days, with an annual simple flat interest rate of 2% if the commission fee (withdrawal or payment) is 5%.

Principal (initial amount), P = 464


Annual simple interest rate, R = 2%


From date: Sep 1, 2018


To date: Sep 4, 2018


Duration, T = 3 days


Commission fee (withdrawal or payment), F = 5%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(464 × 2% × 3) ÷ 365 =


(464 × 2 × 3) ÷ (365 × 100) =


2,784 ÷ 36,500 ≈


0.076273972603 ≈


0.08

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

B = P + I =


464 + 0.076273972603 =


464.076273972603 ≈


464.08

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 5%) × 464.076273972603 =


95% × 464.076273972603 ≈


440.872460273973 ≈


440.87

Pr = Investment profit:

Pr = D - P =


440.872460273973 - 464 =


- 23.127539726027 ≈


- 23.13

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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