Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 1,200 units (Dollar, Euro, Pound, etc.), from date: Nov 19, 2018, to date: Dec 19, 2018, namely for a period of 30 days, with an annual simple flat interest rate of 0% if the commission fee (withdrawal or payment) is 0.09%.

Principal (initial amount), P = 1,200


Annual simple interest rate, R = 0%


From date: Nov 19, 2018


To date: Dec 19, 2018


Duration, T = 30 days


Commission fee (withdrawal or payment), F = 0.09%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(1,200 × 0% × 30) ÷ 365 =


(1,200 × 0 × 30) ÷ (365 × 100) =


0 ÷ 36,500 =


0

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

B = P + I =


1,200 + 0 =


1,200

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 0.09%) × 1,200 =


99.91% × 1,200 =


1,198.92

Pr = Investment profit:

Pr = D - P =


1,198.92 - 1,200 =


- 1.08

Signs: % percent, ÷ divide, × multiply;

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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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