Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 15,000 units (Dollar, Euro, Pound, etc.), from date: Mar 30, 960, to date: May 4, 2010, namely for a period of 383,539 days (12,602 Months without 26 Days), with an annual simple flat interest rate of 6.5% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 15,000


Annual simple interest rate, R = 6.5%


From date: Mar 30, 960


To date: May 4, 2010


Duration, T = 383,539 days (12,602 Months without 26 Days)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(15,000 × 6.5% × 383,539) ÷ 365 =


(15,000 × 6.5 × 383,539) ÷ (365 × 100) =


37,395,052,500 ÷ 36,500 =


1,024,521.986301369863 ≈


1,024,521.99

B = Amount earned:

B = P + I =


15,000 + 1,024,521.986301369863 =


1,039,521.986301369863 ≈


1,039,521.99

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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