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

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From 2005 to 2006, by what percent did the sales of Company [#permalink] New post 28 Jun 2013, 07:03
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63% (02:14) correct 36% (00:44) wrong based on 44 sessions
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] New post 28 Jun 2013, 07:13
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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] New post 28 Jun 2013, 07:14
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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.

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

Cheers
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Re: From 2005 to 2006, by what percent did the sales of Company [#permalink] New post 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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RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

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