Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 49,139.2 units (Dollar, Euro, Pound, etc.), from date: Nov 22, 2018, to date: Dec 22, 2018, namely for a period of 30 days, with an annual simple flat interest rate of - 1% if the commission fee (withdrawal or payment) is 1%.

Principal (initial amount), P = 49,139.2


Annual simple interest rate, R = - 1%


From date: Nov 22, 2018


To date: Dec 22, 2018


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 =


(49,139.2 × - 1% × 30) ÷ 365 =


(49,139.2 × - 1 × 30) ÷ (365 × 100) =


- 1,474,176 ÷ 36,500 ≈


- 40.388383561644 ≈


- 40.39

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

B = P + I =


49,139.2 + (- 40.388383561644) =


49,139.2 - 40.388383561644 =


49,098.811616438356 ≈


49,098.81

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 1%) × 49,098.811616438356 =


99% × 49,098.811616438356 ≈


48,607.823500273972 ≈


48,607.82

Pr = Investment profit:

Pr = D - P =


48,607.823500273972 - 49,139.2 =


- 531.376499726028 ≈


- 531.38

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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