SSC CGL 9 Aug 2015 Shift 1 Paper

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Question : 129 of 200

Marks: +1, -0

The population of a town increases by 5% every year. If the present population is 9261, the population 3 years ago was

8000
5700
6000
7500

Solution:

P =

P_0(1+R/{100})^T

⇒ 9261 =

P_0(1+5/{100})^3

⇒ 9261 =

P_0(1+1/{20})^3

⇒ 9261 =

P_0({21}/{20})^3

⇒

P_0

=

{9261×20×20×20}/{21×21×21}

= 8000

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