Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 1 units (Dollar, Euro, Pound, etc.), from date: Jul 23, 198, to date: May 23, 2019, namely for a period of 665,045 days (21,850 Months), with an annual simple flat interest rate of 0.02% if the commission fee (withdrawal) is 0%.

Principal (initial amount), P = 1


Annual simple interest rate, R = 0.02%


From date: Jul 23, 198


To date: May 23, 2019


Duration, T = 665,045 days (21,850 Months)


Commission fee (withdrawal), F = 0%


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(1 × 0.02% × 665,045) ÷ 365 =


(1 × 0.02 × 665,045) ÷ (365 × 100) =


13,300.9 ÷ 36,500 =


0.364408219178 ≈


0.36

B = Amount earned:

B = P + I =


1 + 0.364408219178 =


1.364408219178 ≈


1.36

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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