Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 10,000 units (Dollar, Euro, Pound, etc.), from date: Feb 21, 2018, to date: Mar 21, 2018, namely for a period of 28 days, with an annual simple flat interest rate of 0.15% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 10,000


Annual simple interest rate, R = 0.15%


From date: Feb 21, 2018


To date: Mar 21, 2018


Duration, T = 28 days


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(10,000 × 0.15% × 28) ÷ 365 =


(10,000 × 0.15 × 28) ÷ (365 × 100) =


42,000 ÷ 36,500 ≈


1.150684931507 ≈


1.15

B = Amount earned:

B = P + I =


10,000 + 1.150684931507 =


10,001.150684931507 ≈


10,001.15

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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