Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 200,000 units (Dollar, Euro, Pound, etc.), from date: Feb 4, 2017, to date: Mar 5, 2018, namely for a period of 394 days (13 Months and 1 Day), with an annual simple flat interest rate of 3% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 200,000


Annual simple interest rate, R = 3%


From date: Feb 4, 2017


To date: Mar 5, 2018


Duration, T = 394 days (13 Months and 1 Day)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(200,000 × 3% × 394) ÷ 365 =


(200,000 × 3 × 394) ÷ (365 × 100) =


236,400,000 ÷ 36,500 ≈


6,476.712328767123 ≈


6,476.71

B = Amount earned:

B = P + I =


200,000 + 6,476.712328767123 =


206,476.712328767123 ≈


206,476.71

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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