Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 3,900 units (Dollar, Euro, Pound, etc.), from date: Jul 1, 2008, to date: Jul 1, 2018, namely for a period of 3,652 days (120 Months), with an annual simple flat interest rate of 0.02% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 3,900


Annual simple interest rate, R = 0.02%


From date: Jul 1, 2008


To date: Jul 1, 2018


Duration, T = 3,652 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 =


(3,900 × 0.02% × 3,652) ÷ 365 =


(3,900 × 0.02 × 3,652) ÷ (365 × 100) =


284,856 ÷ 36,500 ≈


7.804273972603 ≈


7.8

B = Amount earned:

B = P + I =


3,900 + 7.804273972603 =


3,907.804273972603 ≈


3,907.8

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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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