Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 100 units (Dollar, Euro, Pound, etc.), from date: May 24, 2017, to date: Jun 24, 2027, namely for a period of 3,683 days (121 Months), with an annual simple flat interest rate of 5% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 100


Annual simple interest rate, R = 5%


From date: May 24, 2017


To date: Jun 24, 2027


Duration, T = 3,683 days (121 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(100 × 5% × 3,683) ÷ 365 =


(100 × 5 × 3,683) ÷ (365 × 100) =


1,841,500 ÷ 36,500 ≈


50.452054794521 ≈


50.45

B = Amount earned:

B = P + I =


100 + 50.452054794521 =


150.452054794521 ≈


150.45

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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