Calculate the due interest earned by a principal (initial amount of money lent, deposited or borrowed) of 4,000 units (Dollar, Euro, Pound, etc.), from date: Jul 14, 2017, to date: Aug 14, 2047, namely for a period of 10,988 days (361 Months), with an annual simple flat interest rate of 3% if the commission fee (withdrawal or payment) is 0%.

Principal (initial amount), P = 4,000


Annual simple interest rate, R = 3%


From date: Jul 14, 2017


To date: Aug 14, 2047


Duration, T = 10,988 days (361 Months)


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


No. of days in a year, N = 365


I = Simple interest:

I = (P × R × T) ÷ N =


(4,000 × 3% × 10,988) ÷ 365 =


(4,000 × 3 × 10,988) ÷ (365 × 100) =


131,856,000 ÷ 36,500 ≈


3,612.493150684932 ≈


3,612.49

B = Amount earned:

B = P + I =


4,000 + 3,612.493150684932 =


7,612.493150684932 ≈


7,612.49

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