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: Jun 1, 2017, to date: Nov 1, 2017, namely for a period of 153 days (5 Months), with an annual simple flat interest rate of 10% if the commission fee (withdrawal or payment) is 898%.

Principal (initial amount), P = 100


Annual simple interest rate, R = 10%


From date: Jun 1, 2017


To date: Nov 1, 2017


Duration, T = 153 days (5 Months)


Commission fee (withdrawal or payment), F = 898%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(100 × 10% × 153) ÷ 365 =


(100 × 10 × 153) ÷ (365 × 100) =


153,000 ÷ 36,500 ≈


4.191780821918 ≈


4.19

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

B = P + I =


100 + 4.191780821918 =


104.191780821918 ≈


104.19

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 898%) × 104.191780821918 =


- 798% × 104.191780821918 ≈


- 831.450410958906 ≈


- 831.45

Pr = Investment profit:

Pr = D - P =


- 831.450410958906 - 100 =


- 931.450410958906 ≈


- 931.45

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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