Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 4,018 units (Dollar, Euro, Pound, etc.), from date: Dec 4, 2017, to date: Dec 3, 2018, namely for a period of 364 days (12 Months without 1 Days), with an annual simple flat interest rate of 2,018% if the commission fee (withdrawal or payment) is - 364%.

Principal (initial amount), P = 4,018


Annual simple interest rate, R = 2,018%


From date: Dec 4, 2017


To date: Dec 3, 2018


Duration, T = 364 days (12 Months without 1 Days)


Commission fee (withdrawal or payment), F = - 364%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(4,018 × 2,018% × 364) ÷ 365 =


(4,018 × 2,018 × 364) ÷ (365 × 100) =


2,951,429,936 ÷ 36,500 ≈


80,861.094136986301 ≈


80,861.09

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

B = P + I =


4,018 + 80,861.094136986301 =


84,879.094136986301 ≈


84,879.09

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - (- 364%)) × 84,879.094136986301 =


(1 + 364%) × 84,879.094136986301 =


464% × 84,879.094136986301 ≈


393,838.996795616437 ≈


393,839

Pr = Investment profit:

Pr = D - P =


393,838.996795616437 - 4,018 =


389,820.996795616437 ≈


389,821

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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