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: Mar 27, 2017, to date: Apr 27, 2027, namely for a period of 3,683 days (121 Months), with an annual simple flat interest rate of 7% if the commission fee (withdrawal or payment) is 826%.

Principal (initial amount), P = 100


Annual simple interest rate, R = 7%


From date: Mar 27, 2017


To date: Apr 27, 2027


Duration, T = 3,683 days (121 Months)


Commission fee (withdrawal or payment), F = 826%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(100 × 7% × 3,683) ÷ 365 =


(100 × 7 × 3,683) ÷ (365 × 100) =


2,578,100 ÷ 36,500 ≈


70.632876712329 ≈


70.63

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

B = P + I =


100 + 70.632876712329 =


170.632876712329 ≈


170.63

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 826%) × 170.632876712329 =


- 726% × 170.632876712329 ≈


- 1,238.794684931509 ≈


- 1,238.79

Pr = Investment profit:

Pr = D - P =


- 1,238.794684931509 - 100 =


- 1,338.794684931509 ≈


- 1,338.79

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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