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M12-11

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Intern
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Joined: 10 Mar 2015
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Re: M12-11 [#permalink]

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New post 30 Aug 2017, 22:35
I am agreeing to the point that option A should be the OA.

Need clarification from experts on this.
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Re: M12-11 [#permalink]

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New post 09 Dec 2017, 18:21
arjun7dk wrote:
Took population as 100! for it to double it means it should become 200.
1.now percentage increase from 100 to 200 is 100%
2.now divide 100% by 20% to get 5 years
3.the question asks how many years will elapse before the population of the country doubles?
so 5-1= 4 years.
I dont know if my approach is correct!


Thats incorrect mate. You have assumed 100 across all five years.

1st year population will be 120.
2nd year You have to take 120% of 120 rather than 100. So it will be 144.
3rd year 120% of 144 and so on..
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Re: M12-11 [#permalink]

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New post 17 Jan 2018, 03:04
Hi Experts,
I did not get how 4 is the ans despite in 4th year the value crossed double but in question we need the year before value getting doubled ( i hope in ques they need year when value <=1.99999999)Is it due to approximation ans is 4 or any other reason.
Pls explain.
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Re: M12-11 [#permalink]

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New post 17 Jan 2018, 05:07
tejyr wrote:
Hi Experts,
I did not get how 4 is the ans despite in 4th year the value crossed double but in question we need the year before value getting doubled ( i hope in ques they need year when value <=1.99999999)Is it due to approximation ans is 4 or any other reason.
Pls explain.


Here "before" means "by the time the population of the country doubles".
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Re M12-11 [#permalink]

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New post 26 Jan 2018, 13:39
I think this is a poor-quality question and the explanation isn't clear enough, please elaborate.
Re M12-11   [#permalink] 26 Jan 2018, 13:39

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