Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 10 units (Dollar, Euro, Pound, etc.), from date: Dec 18, 428, to date: Nov 18, 2017, namely for a period of 580,340 days (19,067 Months), with an annual simple flat interest rate of 856% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 10


Annual simple interest rate, R = 856%


From date: Dec 18, 428


To date: Nov 18, 2017


Duration, T = 580,340 days (19,067 Months)


Commission fee (withdrawal or payment), F = 0%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(10 × 856% × 580,340) ÷ 365 =


(10 × 856 × 580,340) ÷ (365 × 100) =


4,967,710,400 ÷ 36,500 ≈


136,101.654794520548 ≈


136,101.65

B = Amount earned:

B = P + I =


10 + 136,101.654794520548 =


136,111.654794520548 ≈


136,111.65

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

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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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