Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 6,000 units (Dollar, Euro, Pound, etc.), from date: Jan 11, 2019, to date: Feb 11, 2019, namely for a period of 31 days, with an annual simple flat interest rate of 8% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 6,000


Annual simple interest rate, R = 8%


From date: Jan 11, 2019


To date: Feb 11, 2019


Duration, T = 31 days


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(6,000 × 8% × 31) ÷ 365 =


(6,000 × 8 × 31) ÷ (365 × 100) =


1,488,000 ÷ 36,500 ≈


40.767123287671 ≈


40.77

B = Amount earned:

B = P + I =


6,000 + 40.767123287671 =


6,040.767123287671 ≈


6,040.77

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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