Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 20,000 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: Jun 15, 2007, to date: Jun 15, 2017, namely for a period of 3,653 days (120 Months), with an annual simple flat interest rate of 10% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 20,000


Annual simple interest rate, R = 10%


From date: Jun 15, 2007


To date: Jun 15, 2017


Duration, T = 3,653 days (120 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(20,000 × 10% × 3,653) ÷ 365 =


(20,000 × 10 × 3,653) ÷ (365 × 100) =


730,600,000 ÷ 36,500 ≈


20,016.438356164384 ≈


20,016.44

B = Amount earned:

B = P + I =


20,000 + 20,016.438356164384 =


40,016.438356164384 ≈


40,016.44

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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