Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 80 units (Dollar, Euro, Pound, etc.), from date: Jun 6, 2017, to date: Jun 6, 2018, namely for a period of 365 days (12 Months), with an annual simple flat interest rate of 12% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 80


Annual simple interest rate, R = 12%


From date: Jun 6, 2017


To date: Jun 6, 2018


Duration, T = 365 days (12 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(80 × 12% × 365) ÷ 365 =


(80 × 12 × 365) ÷ (365 × 100) =


350,400 ÷ 36,500 =


9.6

B = Amount earned:

B = P + I =


80 + 9.6 =


89.6

Signs: % percent, ÷ divide, × multiply;

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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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