Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 300 units (Dollar, Euro, Pound, etc.), from date: Oct 9, 2018, to date: Oct 9, 2021, namely for a period of 1,096 days (36 Months), with an annual simple flat interest rate of 4% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 300


Annual simple interest rate, R = 4%


From date: Oct 9, 2018


To date: Oct 9, 2021


Duration, T = 1,096 days (36 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(300 × 4% × 1,096) ÷ 365 =


(300 × 4 × 1,096) ÷ (365 × 100) =


1,315,200 ÷ 36,500 ≈


36.032876712329 ≈


36.03

B = Amount earned:

B = P + I =


300 + 36.032876712329 =


336.032876712329 ≈


336.03

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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