Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 800 units (Dollar, Euro, Pound, etc.), from date: May 14, 2012, to date: Mar 30, 2016, namely for a period of 1,416 days (46 Months and 16 Days), with an annual simple flat interest rate of 8% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 800


Annual simple interest rate, R = 8%


From date: May 14, 2012


To date: Mar 30, 2016


Duration, T = 1,416 days (46 Months and 16 Days)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(800 × 8% × 1,416) ÷ 365 =


(800 × 8 × 1,416) ÷ (365 × 100) =


9,062,400 ÷ 36,500 ≈


248.284931506849 ≈


248.28

B = Amount earned:

B = P + I =


800 + 248.284931506849 =


1,048.284931506849 ≈


1,048.28

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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