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Question

The population of a city increases by 30% every year. If the present population is 338000, then What was the population of the city two years ago?

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Solution

Let initial population be p
As population increased by 30% per year.
So, population after 2 years
=p(1+30100)2
=p(1.3)2
Given that ,338000=1.69p
p=3380001.69
p=2,00,000
So, population two years ago=2,00,000

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