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: Nov 6, 2019, to date: Dec 6, 2019, namely for a period of 30 days, with an annual simple flat interest rate of 5% if the commission fee (withdrawal) is 0%.

Principal (initial amount), P = 1,000


Annual simple interest rate, R = 5%


From date: Nov 6, 2019


To date: Dec 6, 2019


Duration, T = 30 days


Commission fee (withdrawal), F = 0%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(1,000 × 5% × 30) ÷ 365 =


(1,000 × 5 × 30) ÷ (365 × 100) =


150,000 ÷ 36,500 ≈


4.109589041096 ≈


4.11

B = Amount earned:

B = P + I =


1,000 + 4.109589041096 =


1,004.109589041096 ≈


1,004.11

Signs: % percent, ÷ divide, × multiply, = equal, ≈ 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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