Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 3,700 units (Dollar, Euro, Pound, etc.), from date: Jan 25, 2009, to date: Feb 25, 2018, namely for a period of 3,318 days (109 Months), with an annual simple flat interest rate of 4% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 3,700


Annual simple interest rate, R = 4%


From date: Jan 25, 2009


To date: Feb 25, 2018


Duration, T = 3,318 days (109 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(3,700 × 4% × 3,318) ÷ 365 =


(3,700 × 4 × 3,318) ÷ (365 × 100) =


49,106,400 ÷ 36,500 ≈


1,345.380821917808 ≈


1,345.38

B = Amount earned:

B = P + I =


3,700 + 1,345.380821917808 =


5,045.380821917808 ≈


5,045.38

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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