Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 770 units (Dollar, Euro, Pound, etc.), from date: May 16, 2016, to date: Dec 16, 2017, namely for a period of 579 days (19 Months), with an annual simple flat interest rate of 3.5% if the commission fee (withdrawal or payment) is 1%.

Principal (initial amount), P = 770


Annual simple interest rate, R = 3.5%


From date: May 16, 2016


To date: Dec 16, 2017


Duration, T = 579 days (19 Months)


Commission fee (withdrawal or payment), F = 1%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(770 × 3.5% × 579) ÷ 365 =


(770 × 3.5 × 579) ÷ (365 × 100) =


1,560,405 ÷ 36,500 ≈


42.750821917808 ≈


42.75

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

B = P + I =


770 + 42.750821917808 =


812.750821917808 ≈


812.75

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 1%) × 812.750821917808 =


99% × 812.750821917808 ≈


804.62331369863 ≈


804.62

Pr = Investment profit:

Pr = D - P =


804.62331369863 - 770 =


34.62331369863 ≈


34.62

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

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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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