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What was the percent increase in population of City K from

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What was the percent increase in population of City K from [#permalink] New post 24 Mar 2008, 12:41
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Question Stats:

75% (01:23) correct 25% (00:25) wrong based on 38 sessions
What was the percent increase in population of City K from 1980 to 1990?

1) In 1970 the population of City K was 160,000
2) In 1980 the population of City K was 20% greater than it was in 1970, and in 1990 the population of City K was 30% greater than it was in 1970.
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Re: What was the percent increase in population of City K from [#permalink] New post 24 Mar 2008, 13:57
Statement 1:
Tells us about population in 1970 and nothing else, so this alone is insufficient.

Statement 2:
Tells us that in 1980 population is 20% more than it was in 1970. Say it was x in 1970, then in 1980 it is 1.2x.
Also given that in 1990 population is 30% more than it was in 1970. Say it was x in 1970, then in 1990 it is 1.3x.

Percent Increase from 1980 to 1990 = (1.3x-1.2x)*100/1.2x (Although you don't need to calcluate it, as answer is not required to be filled in anywhere.

As statement 2 alone can answer the question, so Answer B.
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Re: What was the percent increase in population of City K from [#permalink] New post 28 Jun 2011, 10:07
Let the population of 1970 = 100
so population of 1980 = 120
thus population of 1990 = 130
percentage increase = 10/120*100
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Re: What was the percent increase in population of City K from [#permalink] New post 28 Jun 2011, 15:10
((90 - 80 )/ 80 )*100

1. Not sufficient

we dont know anything about 80 or 90.

2. Sufficient

70 80 90
x 120x/100 130x/100

from this we can easily find out ((80-90)/80 )*100

Answer is B.
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Re: What was the percent increase in population of City K from [#permalink] New post 28 Jun 2011, 17:51
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B..
Let population in 1970=100
Then, in 1980= 120
in 1990= 130

We can easily find the percent increase from 1980 to 1990 now..
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Re: What was the percent increase in population of City K from [#permalink] New post 14 Sep 2014, 18:15
Hello from the GMAT Club BumpBot!

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Re: What was the percent increase in population of City K from   [#permalink] 14 Sep 2014, 18:15
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