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# From 2005 to 2006, by what percent did the sales of Company

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Director
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From 2005 to 2006, by what percent did the sales of Company [#permalink]

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28 Jun 2013, 08:03
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25% (medium)

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68% (02:05) correct 32% (00:34) wrong based on 69 sessions

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From 2005 to 2006, by what percent did the sales of Company A increase?

(1) In 2005, the sales for Company A were 1/4 of the sales of Company B.

(2) In 2006, the sales for Company A were 3/4 of the sales of Company B.

[Reveal] Spoiler:
Why isn't it C?
[Reveal] Spoiler: OA

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Re: From 2005 to 2006, by what percent did the sales of Company [#permalink]

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28 Jun 2013, 08:13
1
KUDOS
From 2005 to 2006, by what percent did the sales of Company A increase?

$$\frac{S_{2006}-S_{2005}}{S_{2005}}=?$$

(1) In 2005, the sales for Company A were 1/4 of the sales of Company B.
(2) In 2006, the sales for Company A were 3/4 of the sales of Company B.
On their own they are clearly not sufficient.

1+2)From 1 $$S_{2005}=\frac{1}{4}*SB_{2005}$$: from 2 $$S_{2006}=\frac{3}{4}*SB_{2006}$$

Re write the equation

$$\frac{0.75*SB_{2006}-0.25*SB_{2005}}{0.25*SB_{2005}}=?$$ Still not sufficient
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Re: From 2005 to 2006, by what percent did the sales of Company [#permalink]

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28 Jun 2013, 08:14
1
KUDOS
Expert's post
From 2005 to 2006, by what percent did the sales of Company A increase?

(1) In 2005, the sales for Company A were 1/4 of the sales of Company B.
(2) In 2006, the sales for Company A were 3/4 of the sales of Company B.

The answer is straight E. If the sales of Company B in 2005 and 2006, were the same (say $100 and$100), then the increase in sales of Company A would be (75-25)/25*100=200% BUT if the sales of Company B in 2005 and 2006, were NOT the same (say $100 and$200), then the increase in sales of Company A would be different: (150-25)/25*100=500%. Not sufficient.

Hope it's clear.
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Re: From 2005 to 2006, by what percent did the sales of Company [#permalink]

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28 Jun 2013, 08:18
Bunuel wrote:
From 2005 to 2006, by what percent did the sales of Company A increase?

(1) In 2005, the sales for Company A were 1/4 of the sales of Company B.
(2) In 2006, the sales for Company A were 3/4 of the sales of Company B.

The answer is straight E. If the sales of Company B in 2005 and 2006, were the same (say $100 and$100), then the increase in sales of Company A would be (75-25)/25*100=200% BUT if the sales of Company B in 2005 and 2006, were NOT the same (say $100 and$200), then the increase in sales of Company A would be different: (150-25)/25*100=500%. Not sufficient.

Hope it's clear.

Made a silly assumption! Thanks for pointing it out...
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Re: From 2005 to 2006, by what percent did the sales of Company [#permalink]

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09 Dec 2013, 07:53
Bunuel wrote:
From 2005 to 2006, by what percent did the sales of Company A increase?

(1) In 2005, the sales for Company A were 1/4 of the sales of Company B.
(2) In 2006, the sales for Company A were 3/4 of the sales of Company B.

The answer is straight E. If the sales of Company B in 2005 and 2006, were the same (say $100 and$100), then the increase in sales of Company A would be (75-25)/25*100=200% BUT if the sales of Company B in 2005 and 2006, were NOT the same (say $100 and$200), then the increase in sales of Company A would be different: (150-25)/25*100=500%. Not sufficient.

Hope it's clear.

Don't they need to clarify that they mean the sales of Company B in the same year?
Or when they say "In 2005" they mean not only for sales of Company A but for both?

Cheers
J
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Re: From 2005 to 2006, by what percent did the sales of Company [#permalink]

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09 Dec 2013, 07:59
jlgdr wrote:
Bunuel wrote:
From 2005 to 2006, by what percent did the sales of Company A increase?

(1) In 2005, the sales for Company A were 1/4 of the sales of Company B.
(2) In 2006, the sales for Company A were 3/4 of the sales of Company B.

The answer is straight E. If the sales of Company B in 2005 and 2006, were the same (say $100 and$100), then the increase in sales of Company A would be (75-25)/25*100=200% BUT if the sales of Company B in 2005 and 2006, were NOT the same (say $100 and$200), then the increase in sales of Company A would be different: (150-25)/25*100=500%. Not sufficient.

Hope it's clear.

Don't they need to clarify that they mean the sales of Company B in the same year?
Or when they say "In 2005" they mean not only for sales of Company A but for both?

Cheers
J

Yes, "in 2005..." and "in 2006..." refer to both company A and company B.
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Re: From 2005 to 2006, by what percent did the sales of Company   [#permalink] 09 Dec 2013, 07:59
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