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Worked Examples · Example 9

Q.Find the present value of an immediate annuity of ₹1,000 paid at the end of each year for 3 years at 10% per annum. [Given (1.1)^(-3) = 0.7513]

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With end-of-year payments this is an immediate annuity, C=1000C=1000, i=0.10i=0.10, n=3n=3:

P=C[1−(1+i)−ni]=1000[1−(1.1)−30.1]=1000[1−0.75130.1]=1000×0.24870.1=1000×2.487=₹2,487.P=C\left[\frac{1-(1+i)^{-n}}{i}\right]=1000\left[\frac{1-(1.1)^{-3}}{0.1}\right]=1000\left[\frac{1-0.7513}{0.1}\right]=1000\times\frac{0.2487}{0.1}=1000\times2.487=₹2{,}487.

Check (independent verification) — discount each payment separately:

  • Year 1: 10001.1=₹909.09\dfrac{1000}{1.1}=₹909.09.
  • Year 2: 1000(1.1)2=10001.21=₹826.45\dfrac{1000}{(1.1)^{2}}=\dfrac{1000}{1.21}=₹826.45. …

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