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# the annual birth and death rate

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Manager
Joined: 07 Feb 2010
Posts: 162
Followers: 2

Kudos [?]: 62 [0], given: 101

the annual birth and death rate [#permalink]  20 Oct 2010, 03:43
00:00

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
Manager
Joined: 08 Sep 2010
Posts: 237
Location: India
WE 1: 6 Year, Telecom(GSM)
Followers: 4

Kudos [?]: 70 [0], given: 21

Re: the annual birth and death rate [#permalink]  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?

Retired Moderator
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Kudos [?]: 277 [0], given: 109

Re: the annual birth and death rate [#permalink]  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?

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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Manager
Joined: 17 Apr 2010
Posts: 109
Followers: 2

Kudos [?]: 50 [0], given: 12

Re: the annual birth and death rate [#permalink]  20 Oct 2010, 07:41
Could you please advise if there are any easier ways to solve this?
Manager
Joined: 29 Sep 2008
Posts: 154
Followers: 2

Kudos [?]: 25 [0], given: 1

Re: the annual birth and death rate [#permalink]  20 Oct 2010, 08:08
didn't understand the question
Intern
Joined: 10 Oct 2010
Posts: 36
Followers: 0

Kudos [?]: 1 [0], given: 3

Re: the annual birth and death rate [#permalink]  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
Manager
Joined: 26 Mar 2010
Posts: 125
Followers: 2

Kudos [?]: 5 [0], given: 17

Re: the annual birth and death rate [#permalink]  21 Oct 2010, 17:03
LENGTHY CALCN
Re: the annual birth and death rate   [#permalink] 21 Oct 2010, 17:03
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