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: May 6, 2017, to date: May 6, 2037, namely for a period of 7,305 days (240 Months), with an annual simple flat interest rate of 0.5% if the commission fee (withdrawal or payment) is 806%.

Principal (initial amount), P = 1,000


Annual simple interest rate, R = 0.5%


From date: May 6, 2017


To date: May 6, 2037


Duration, T = 7,305 days (240 Months)


Commission fee (withdrawal or payment), F = 806%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(1,000 × 0.5% × 7,305) ÷ 365 =


(1,000 × 0.5 × 7,305) ÷ (365 × 100) =


3,652,500 ÷ 36,500 ≈


100.068493150685 ≈


100.07

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

B = P + I =


1,000 + 100.068493150685 =


1,100.068493150685 ≈


1,100.07

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 806%) × 1,100.068493150685 =


- 706% × 1,100.068493150685 ≈


- 7,766.483561643836 ≈


- 7,766.48

Pr = Investment profit:

Pr = D - P =


- 7,766.483561643836 - 1,000 =


- 8,766.483561643836 ≈


- 8,766.48

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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