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: Dec 9, 2016, to date: Jan 9, 2017, namely for a period of 31 days, with an annual simple flat interest rate of 3% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 100


Annual simple interest rate, R = 3%


From date: Dec 9, 2016


To date: Jan 9, 2017


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 =


(100 × 3% × 31) ÷ 365 =


(100 × 3 × 31) ÷ (365 × 100) =


9,300 ÷ 36,500 ≈


0.254794520548 ≈


0.25

B = Amount earned:

B = P + I =


100 + 0.254794520548 =


100.254794520548 ≈


100.25

Signs: % percent, ÷ divide, × multiply, ≈ approximately equal;

Writing numbers: comma ',' as thousands separator; point '.' as a decimal mark;

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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