Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 1,000 units (Dollar, Euro, Pound, etc.), from date: Jul 10, 2017, to date: Jul 10, 2027, namely for a period of 3,652 days (120 Months), with an annual simple flat interest rate of 3% if the commission fee (withdrawal or payment) is 404%.

Principal (initial amount), P = 1,000


Annual simple interest rate, R = 3%


From date: Jul 10, 2017


To date: Jul 10, 2027


Duration, T = 3,652 days (120 Months)


Commission fee (withdrawal or payment), F = 404%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(1,000 × 3% × 3,652) ÷ 365 =


(1,000 × 3 × 3,652) ÷ (365 × 100) =


10,956,000 ÷ 36,500 ≈


300.164383561644 ≈


300.16

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

B = P + I =


1,000 + 300.164383561644 =


1,300.164383561644 ≈


1,300.16

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 404%) × 1,300.164383561644 =


- 304% × 1,300.164383561644 ≈


- 3,952.499726027398 ≈


- 3,952.5

Pr = Investment profit:

Pr = D - P =


- 3,952.499726027398 - 1,000 =


- 4,952.499726027398 ≈


- 4,952.5

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