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the annual birth and death rate

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Manager
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the annual birth and death rate [#permalink] New post 20 Oct 2010, 03:43
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

25% (00:00) correct 75% (00:28) wrong based on 4 sessions
the annual birth and death rate in a country per 1000 are 39.4 and 19.4 respectively . the number of years in which the population would be doubled assuming there is no emigration
or immigration is
a 20
b 25
c 30
d 35
e 40
[Reveal] Spoiler: OA
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Re: the annual birth and death rate [#permalink] New post 20 Oct 2010, 04:03
anilnandyala wrote:
the annual birth and death rate in a country per 1000 are 39.4 and 19.4 respectively . the number of years in which the population would be doubled assuming there is no emigration
or immigration is
a 20
b 25
c 30
d 35
e 40


Suppose the population of the country in current year is 1000.
So annual increase is 1000 + 39.4 - 19.4=1020
Hence every year there is an increase of 2%.

2000=1000(1+(2/100))^n

n=35 Answer is D. (But Calculation is somewhat tedious.) Anything simple than this?

Consider KUDOS if its helpful.
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Re: the annual birth and death rate [#permalink] New post 20 Oct 2010, 04:28
ankitranjan wrote:
Suppose the population of the country in current year is 1000.
So annual increase is 1000 + 39.4 - 19.4=1020
Hence every year there is an increase of 2%.

2000=1000(1+(2/100))^n

n=35 Answer is D. (But Calculation is somewhat tedious.) Anything simple than this?

Consider KUDOS if its helpful.


Yes, I also solved it in that way. The problem is that you cannot use a scientific calculator during the exam LOL.
I think we need the help of the moderators!
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Re: the annual birth and death rate [#permalink] New post 20 Oct 2010, 07:41
Could you please advise if there are any easier ways to solve this?
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Re: the annual birth and death rate [#permalink] New post 20 Oct 2010, 08:08
didn't understand the question
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Re: the annual birth and death rate [#permalink] New post 20 Oct 2010, 13:10
I stopped when I realized how long it would take me to calculate. But 35 seems good enough for me
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Re: the annual birth and death rate [#permalink] New post 21 Oct 2010, 17:03
LENGTHY CALCN :(
Re: the annual birth and death rate   [#permalink] 21 Oct 2010, 17:03
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