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Of the 200 books a used-book store added to inventory last

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Of the 200 books a used-book store added to inventory last [#permalink]

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New post 16 Mar 2012, 01:53
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Difficulty:

  35% (medium)

Question Stats:

76% (00:49) correct 24% (01:53) wrong based on 21 sessions

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Of the 200 books a used-book store added to inventory last Monday, how many were sold by the end of the week?

(1) The 200 books added represented a 4 percent increase to the store’s inventory.
(2) In the week between the addition of the 200 books and the end of the week, the store’s inventory decreased by 6 percent.

How come the answer is E and not A?

This is why I think it should be A

Let x be the number of books before 200 were added.

Total inventory (x+200).

200 = 0.04(x+200)

We can calculate x and the difference.

Statement B - doesn't give us any meaningful information.
[Reveal] Spoiler: OA

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Re: Of the 200 books a used-book store added to inventory last [#permalink]

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New post 16 Mar 2012, 02:24
enigma123 wrote:
Of the 200 books a used-book store added to inventory last Monday, how many were sold by the end of the week?

(1) The 200 books added represented a 4 percent increase to the store’s inventory.
(2) In the week between the addition of the 200 books and the end of the week, the store’s inventory decreased by 6 percent.

How come the answer is E and not A?

This is why I think it should be A

Let x be the number of books before 200 were added.

Total inventory (x+200).

200 = 0.04(x+200)

We can calculate x and the difference.

Statement B - doesn't give us any meaningful information.


The question is: how many of the 200 books were sold. How can the answer be A, if (1) says nothing about sales at all?

Of the 200 books a used-book store added to inventory last Monday, how many were sold by the end of the week?

(1) The 200 books added represented a 4 percent increase to the store’s inventory --> Inventory on Monday = 5,200 (5,000+5,000*0.04=5,000+200=5,200). Not sufficient.

(2) In the week between the addition of the 200 books and the end of the week, the store’s inventory decreased by 6 percent. Clearly insufficient.

(1)+(2) From (2) inventory decreased by 6%, hence the store sold 5,200*0.06=312 books, but we don't know how many out of those 312 were from 200 books added to inventory last Monday. Not sufficient.

Answer: E.
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Re: Of the 200 books a used-book store added to inventory last [#permalink]

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New post 29 Mar 2017, 04:42
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Re: Of the 200 books a used-book store added to inventory last   [#permalink] 29 Mar 2017, 04:42
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