Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 4,000 units (Dollar, Euro, Pound, etc.), from date: Sep 11, 2017, to date: Sep 18, 2017, namely for a period of 7 days, with an annual simple flat interest rate of 1,400% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 4,000


Annual simple interest rate, R = 1,400%


From date: Sep 11, 2017


To date: Sep 18, 2017


Duration, T = 7 days


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(4,000 × 1,400% × 7) ÷ 365 =


(4,000 × 1,400 × 7) ÷ (365 × 100) =


39,200,000 ÷ 36,500 =


1,073.972602739726 ≈


1,073.97

B = Amount earned:

B = P + I =


4,000 + 1,073.972602739726 =


5,073.972602739726 ≈


5,073.97

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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