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Company Z

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by umaa » Wed Dec 16, 2009 7:46 pm
Company Z only sells chairs and tables. what percent of its revenue in 2008 did company derive from its sales of tables?

1. In 2008, the average price of tables sold by company Z was 10% higher than the average price of chairs sold by Company Z?

2. In 2008, Company Z sold 20% fewer tables than chairs.
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Source: — Data Sufficiency |
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by mehravikas » Wed Dec 16, 2009 8:15 pm
E???????
umaa wrote:Company Z only sells chairs and tables. what percent of its revenue in 2008 did company derive from its sales of tables?

1. In 2008, the average price of tables sold by company Z was 10% higher than the average price of chairs sold by Company Z?

2. In 2008, Company Z sold 20% fewer tables than chairs.
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by satish.nagdev » Wed Dec 16, 2009 8:37 pm
I think C
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by pandeyvineet24 » Thu Dec 17, 2009 9:06 pm
IMO C
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by Stuart@KaplanGMAT » Thu Dec 17, 2009 10:22 pm
umaa wrote:Company Z only sells chairs and tables. what percent of its revenue in 2008 did company derive from its sales of tables?

1. In 2008, the average price of tables sold by company Z was 10% higher than the average price of chairs sold by Company Z?

2. In 2008, Company Z sold 20% fewer tables than chairs.
A good general equation to know for test day:

Revenue from sales of products x, y, z, ... = Price(x)*Quantity(x) + Price(y)*Quantity(y) + Price(z)*Quantity(z) + ...

For this question, we're asked what % of revenue came from the sale of 1 of only 2 products. So basically, we want to know the ratio of revenue(tables):revenue(chairs).

Plugging into our revenue equation, we want:

P(c)Q(c)/P(t)Q(t)

It should be very clear that neither 1 nor 2 is sufficient alone, since each only relates to one of our missing variables (i.e. price or quantity). So, let's eliminate A, B and D and jump right to combination.

From (1), we know that P(c)/P(t) = 1/1.1

From (2), we know that Q(c)/Q(t) = 1/.8

Combined, we know that the ratio is (1*1)/(1.1*.8).. sufficient, choose C.
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by ssuarezo » Fri Dec 18, 2009 11:26 am
Thanks Stuart.
Your explanation is clear.
To all the others: please, when submitting an answer, give your logic to find your answer.
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by umaa » Mon Dec 21, 2009 9:15 am
OA is C. Thanks everyone!
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