Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 3,619 units (Dollar, Euro, Pound, etc.), from date: Oct 12, 2018, to date: Nov 12, 2028, namely for a period of 3,684 days (121 Months), with an annual simple flat interest rate of 3% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 3,619


Annual simple interest rate, R = 3%


From date: Oct 12, 2018


To date: Nov 12, 2028


Duration, T = 3,684 days (121 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(3,619 × 3% × 3,684) ÷ 365 =


(3,619 × 3 × 3,684) ÷ (365 × 100) =


39,997,188 ÷ 36,500 ≈


1,095.813369863014 ≈


1,095.81

B = Amount earned:

B = P + I =


3,619 + 1,095.813369863014 =


4,714.813369863014 ≈


4,714.81

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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