Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 180 units (Dollar, Euro, Yen, Pound, Franc, etc.), from date: Jun 1, 2017, to date: Jun 16, 2017, namely for a period of 15 days, with an annual simple flat interest rate of 1% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 180


Annual simple interest rate, R = 1%


From date: Jun 1, 2017


To date: Jun 16, 2017


Duration, T = 15 days


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(180 × 1% × 15) ÷ 365 =


(180 × 1 × 15) ÷ (365 × 100) =


2,700 ÷ 36,500 ≈


0.07397260274 ≈


0.07

B = Amount earned:

B = P + I =


180 + 0.07397260274 =


180.07397260274 ≈


180.07

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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