Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 430,000 units (Dollar, Euro, Pound, etc.), from date: Nov 1, 2014, to date: Jun 1, 2018, namely for a period of 1,308 days (43 Months), with an annual simple flat interest rate of 2.5% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 430,000


Annual simple interest rate, R = 2.5%


From date: Nov 1, 2014


To date: Jun 1, 2018


Duration, T = 1,308 days (43 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(430,000 × 2.5% × 1,308) ÷ 365 =


(430,000 × 2.5 × 1,308) ÷ (365 × 100) =


1,406,100,000 ÷ 36,500 ≈


38,523.287671232877 ≈


38,523.29

B = Amount earned:

B = P + I =


430,000 + 38,523.287671232877 =


468,523.287671232877 ≈


468,523.29

Signs: % percent, ÷ divide, × multiply, = equal, ≈ 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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