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Exercises · Q10

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

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First find the ordinary-annuity present value (C=1000C=1000, i=0.10i=0.10, n=3n=3):

P=1000[1−(1.1)−30.1]=1000×2.487=₹2,487.P=1000\left[\frac{1-(1.1)^{-3}}{0.1}\right]=1000\times2.487=₹2{,}487.

For an annuity due each payment is one year earlier, so multiply by (1+i)(1+i):

Pdue=P(1+i)=2487×1.1=₹2,735.7 (≈₹2,735.5).P_{\text{due}}=P(1+i)=2487\times1.1=₹2{,}735.7\ (\approx ₹2{,}735.5).

Check (independent verification) — discount each payment (first one is today):

  • Beginning of year 1: paid now, present value =₹1,000=₹1{,}000.
  • Beginning of year 2: 10001.1=₹909.09\dfrac{1000}{1.1}=₹909.09. …

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