Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 2,000 units (Dollar, Euro, Pound, etc.), from date: Nov 4, 2018, to date: Jul 4, 2032, namely for a period of 4,991 days (164 Months), with an annual simple flat interest rate of 3% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 2,000


Annual simple interest rate, R = 3%


From date: Nov 4, 2018


To date: Jul 4, 2032


Duration, T = 4,991 days (164 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(2,000 × 3% × 4,991) ÷ 365 =


(2,000 × 3 × 4,991) ÷ (365 × 100) =


29,946,000 ÷ 36,500 ≈


820.438356164384 ≈


820.44

B = Amount earned:

B = P + I =


2,000 + 820.438356164384 =


2,820.438356164384 ≈


2,820.44

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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