Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 12 units (Dollar, Euro, Pound, etc.), from date: Jun 18, 2017, to date: Jul 18, 2018, namely for a period of 395 days (13 Months), with an annual simple flat interest rate of 9% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 12


Annual simple interest rate, R = 9%


From date: Jun 18, 2017


To date: Jul 18, 2018


Duration, T = 395 days (13 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(12 × 9% × 395) ÷ 365 =


(12 × 9 × 395) ÷ (365 × 100) =


42,660 ÷ 36,500 ≈


1.168767123288 ≈


1.17

B = Amount earned:

B = P + I =


12 + 1.168767123288 =


13.168767123288 ≈


13.17

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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