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Re: From 2005 to 2006, by what percent did the sales of Company [#permalink]
28 Jun 2013, 07:13

1

This post received 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 _________________

It is beyond a doubt that all our knowledge that begins with experience.

Re: From 2005 to 2006, by what percent did the sales of Company [#permalink]
28 Jun 2013, 07:14

1

This post received 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.

Re: From 2005 to 2006, by what percent did the sales of Company [#permalink]
28 Jun 2013, 07:18

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.

Answer: E.

Hope it's clear.

Made a silly assumption! Thanks for pointing it out... _________________

Re: From 2005 to 2006, by what percent did the sales of Company [#permalink]
09 Dec 2013, 06:53

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.

Answer: E.

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?

Re: From 2005 to 2006, by what percent did the sales of Company [#permalink]
09 Dec 2013, 06:59

Expert's post

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.

Answer: E.

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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