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: Apr 12, 2017, to date: May 12, 2017, namely for a period of 30 days, with an annual simple flat interest rate of 3% if the commission fee (withdrawal) is 464%.

Principal (initial amount), P = 100


Annual simple interest rate, R = 3%


From date: Apr 12, 2017


To date: May 12, 2017


Duration, T = 30 days


Commission fee (withdrawal), F = 464%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(100 × 3% × 30) ÷ 365 =


(100 × 3 × 30) ÷ (365 × 100) =


9,000 ÷ 36,500 ≈


0.246575342466 ≈


0.25

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

B = P + I =


100 + 0.246575342466 =


100.246575342466 ≈


100.25

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

D = B - F =


B - F% × B =


(1 - F%) × B =


(1 - 464%) × 100.246575342466 =


- 364% × 100.246575342466 ≈


- 364.897534246576 ≈


- 364.9

Pr = Investment profit:

Pr = D - P =


- 364.897534246576 - 100 =


- 464.897534246576 ≈


- 464.9

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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