Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 2,000 units (Dollar, Euro, Pound, etc.), from date: Sep 26, 2018, to date: Oct 26, 2018, namely for a period of 30 days, with an annual simple flat interest rate of 5% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 2,000


Annual simple interest rate, R = 5%


From date: Sep 26, 2018


To date: Oct 26, 2018


Duration, T = 30 days


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(2,000 × 5% × 30) ÷ 365 =


(2,000 × 5 × 30) ÷ (365 × 100) =


300,000 ÷ 36,500 ≈


8.219178082192 ≈


8.22

B = Amount earned:

B = P + I =


2,000 + 8.219178082192 =


2,008.219178082192 ≈


2,008.22

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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