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Solve the following : Find the least number of years for which an annuity of ₹3,000 per annum must run in order that its amount exceeds ₹60,000 at 10% compounded annually. [(1.1)11 = 2.8531, (1.1)12

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Question

Solve the following :

Find the least number of years for which an annuity of ₹3,000 per annum must run in order that its amount exceeds ₹60,000 at 10% compounded annually. [(1.1)11 = 2.8531, (1.1)12 = 3.1384]

Sum
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Solution

Given, C = ₹3,000, A = ₹60,000, r = 10% p.a.

∴ i = `"r"/(100) = (10)/(100)` = 0.1

Since, A = `"C"/"i"[(1 + "i")^"n" - 1]`

∴ 60,000 = `(3,000)/(0.1)[(1 + 0.1)^"n" - 1]`

∴ `(60,000 xx 0.1)/(3,000)` = (1.1)n – 1

∴ 2 = (1.1)n – 1
∴ (1.1)n = 2 + 1
∴ (1.1)n = 3
It is given that (1.1)11 = 2.8531 and (1.1)12 = 3.1384
∴ n will be between 11 years and 12 years.
Thus, the least number of years for which an annuity of ₹3,000 per annum must run is 12 years.

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Annuity
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Chapter 2: Insurance and Annuity - Miscellaneous Exercise 2 [Page 31]

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Balbharati Mathematics and Statistics 2 (Commerce) [English] Standard 12 Maharashtra State Board
Chapter 2 Insurance and Annuity
Miscellaneous Exercise 2 | Q 4.16 | Page 31

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