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M12, Q11

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Manager
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Joined: 10 Jan 2010
Posts: 117
GPA: 4
WE: Programming (Computer Software)
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Kudos [?]: 47 [0], given: 33

M12, Q11 [#permalink] New post 12 Nov 2011, 15:34
If each year the population of the country grows by 20%, how many years will elapse before the population of the country doubles?

a) 3 b) 4 c)5 d) 6 e) 7.

I need a clarification in this question.

By solving, the population is doubled in the 4th year. But the question is " HOw many years will elapse before the population doubles?". Hence, i chose the option (a), which is "3". But the OA is option b.

Where am i going wrong?. Is my understanding of this question incorrect?.

Please help.
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Manager
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Status: SC SC SC SC SC.... Concentrating on SC alone.
Joined: 20 Dec 2010
Posts: 242
Location: India
Concentration: General Management
GMAT Date: 12-30-2011
Followers: 3

Kudos [?]: 45 [0], given: 47

Re: M12, Q11 [#permalink] New post 12 Nov 2011, 18:58
Clearly 4 years. How many years elapsed is same as how many years it took.

so

current year - 100
+1 year 120 << 1 year elapsed>>
+1 year 144 << 2 years elapsed>>
+1 year 173.8 <<3 years elapsed>>
+1 year 208 <<4 years elapsed>>
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Re: M12, Q11   [#permalink] 12 Nov 2011, 18:58
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M12, Q11

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