Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 300 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: Sep 28, 2017, to date: Nov 10, 2017, namely for a period of 43 days (2 Months without 18 Days), with an annual simple flat interest rate of 25% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 300


Annual simple interest rate, R = 25%


From date: Sep 28, 2017


To date: Nov 10, 2017


Duration, T = 43 days (2 Months without 18 Days)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(300 × 25% × 43) ÷ 365 =


(300 × 25 × 43) ÷ (365 × 100) =


322,500 ÷ 36,500 ≈


8.835616438356 ≈


8.84

B = Amount earned:

B = P + I =


300 + 8.835616438356 =


308.835616438356 ≈


308.84

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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