Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 15,520 units (Dollar, Euro, Pound, etc.), from date: Aug 28, 2009, to date: May 25, 2018, namely for a period of 3,192 days (105 Months without 3 Days), with an annual simple flat interest rate of 928% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 15,520


Annual simple interest rate, R = 928%


From date: Aug 28, 2009


To date: May 25, 2018


Duration, T = 3,192 days (105 Months without 3 Days)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(15,520 × 928% × 3,192) ÷ 365 =


(15,520 × 928 × 3,192) ÷ (365 × 100) =


45,972,971,520 ÷ 36,500 =


1,259,533.466301369863 ≈


1,259,533.47

B = Amount earned:

B = P + I =


15,520 + 1,259,533.466301369863 =


1,275,053.466301369863 ≈


1,275,053.47

Signs: % percent, ÷ divide, × multiply, ≈ 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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