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 276% if the commission fee (withdrawal) is 0%.

Principal (initial amount), P = 10


Annual simple interest rate, R = 276%


From date: Dec 18, 428


To date: Nov 18, 2017


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


Commission fee (withdrawal), F = 0%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(10 × 276% × 580,340) ÷ 365 =


(10 × 276 × 580,340) ÷ (365 × 100) =


1,601,738,400 ÷ 36,500 ≈


43,883.243835616438 ≈


43,883.24

B = Amount earned:

B = P + I =


10 + 43,883.243835616438 =


43,893.243835616438 ≈


43,893.24

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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