Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 1,000 units (Dollar, Euro, Pound, etc.), from date: Sep 20, 2017, to date: Sep 20, 2018, namely for a period of 365 days (12 Months), with an annual simple flat interest rate of 5% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 1,000


Annual simple interest rate, R = 5%


From date: Sep 20, 2017


To date: Sep 20, 2018


Duration, T = 365 days (12 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(1,000 × 5% × 365) ÷ 365 =


(1,000 × 5 × 365) ÷ (365 × 100) =


1,825,000 ÷ 36,500 =


50

B = Amount earned:

B = P + I =


1,000 + 50 =


1,050

Signs: % percent, ÷ divide, × multiply;

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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