Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 100 units (Dollar, Euro, Pound, etc.), from date: Sep 26, 706, to date: Oct 26, 2018, namely for a period of 479,229 days (15,745 Months), with an annual simple flat interest rate of 2.75% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 100


Annual simple interest rate, R = 2.75%


From date: Sep 26, 706


To date: Oct 26, 2018


Duration, T = 479,229 days (15,745 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(100 × 2.75% × 479,229) ÷ 365 =


(100 × 2.75 × 479,229) ÷ (365 × 100) =


131,787,975 ÷ 36,500 ≈


3,610.629452054795 ≈


3,610.63

B = Amount earned:

B = P + I =


100 + 3,610.629452054795 =


3,710.629452054795 ≈


3,710.63

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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