Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 40,000 units (Dollar, Euro, Pound, etc.), from date: Jun 15, 278, to date: May 15, 2017, namely for a period of 635,126 days (20,867 Months), with an annual simple flat interest rate of 4% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 40,000


Annual simple interest rate, R = 4%


From date: Jun 15, 278


To date: May 15, 2017


Duration, T = 635,126 days (20,867 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(40,000 × 4% × 635,126) ÷ 365 =


(40,000 × 4 × 635,126) ÷ (365 × 100) =


101,620,160,000 ÷ 36,500 =


2,784,113.972602739726 ≈


2,784,113.97

B = Amount earned:

B = P + I =


40,000 + 2,784,113.972602739726 =


2,824,113.972602739726 ≈


2,824,113.97

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

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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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