Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 327 units (Dollar, Euro, Pound, etc.), from date: Jan 9, 2018, to date: Feb 9, 2018, namely for a period of 31 days, with an annual simple flat interest rate of 13% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 327


Annual simple interest rate, R = 13%


From date: Jan 9, 2018


To date: Feb 9, 2018


Duration, T = 31 days


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(327 × 13% × 31) ÷ 365 =


(327 × 13 × 31) ÷ (365 × 100) =


131,781 ÷ 36,500 ≈


3.610438356164 ≈


3.61

B = Amount earned:

B = P + I =


327 + 3.610438356164 =


330.610438356164 ≈


330.61

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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