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In a certain factory, the union membership was higher in 2010 than in

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In a certain factory, the union membership was higher in 2010 than in  [#permalink]

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New post 03 Sep 2015, 01:03
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A
B
C
D
E

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  15% (low)

Question Stats:

78% (01:38) correct 22% (01:48) wrong based on 231 sessions

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In a certain factory, the union membership was higher in 2010 than in 2008. For the period from 2007 to 2011, the percentage of factory workers that were members of the union remained constant.

The statements above, if true, most strongly support which conclusion?

A) The union membership in 2009 was higher than it was in 2008
B) The factory had more employees in 2010 than in 2008
C) This union collected larger total revenue in dues in 2010 than it did in 2008
D) Throughout this entire manufacturing sector, factory worker unions saw growth from 2008 to 2010
E) In 2010, there were fewer non-union employees in this factory than there were in 2008

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In a certain factory, the union membership was higher in 2010 than in  [#permalink]

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New post 03 Sep 2015, 01:33
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The number of union membership raised between 2008 and 2010. However, the percentage of union memberships to total workers remained constant.

Just ask yourself the question: How would that be possible? Only if the total number of workers goes up the percentage can be held equal if the number of union memberships rises at the same time.

Thats precisely what Option B says, hence correct.
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In a certain factory, the union membership was higher in 2010 than in  [#permalink]

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New post 09 Aug 2018, 16:54

Official Explanation


The credited answer is (B). If number of union employees went up, but the percent of union employees stayed the same, this means the total number of employees had to go up in this period.

We don't know whether the union membership rose continuously, a rise from 2008 to 2009, then another rise from 2009 to 2010; or whether it went down a bit in 2009 and then shot up in 2010. Either could be true, we have no grounds for concluding that 2009 was higher than 2008. Choice (A) is incorrect.

We have no idea what the union dues structure was, and how it might have changed from 2008 to 2010. If dues were exactly the same, then more members would produce more revenue in dues. We don't know, though, whether dues stayed the same or changed. Choice (C) is incorrect.

Choice (D) is much much too broad. We have information about one factory. There is no way we can deduce something about every factory in the sector, factories all over the country. Choice (D) is incorrect.

If the percentage of union employees stayed the same, then the percent of non-union employees also would have had to have stayed the same. If there were more union members, then that means there were more employees overall, which means there would also have to be more non-union members. Choice (E) is incorrect.
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