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Based on the information given, which of the following state

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Based on the information given, which of the following state [#permalink] New post 13 Sep 2017, 12:26
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C
D
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Based on the information given, which of the following statements must be true?

Indicate all such statements.

 For 2008 the dollar amount of sales at Store R was greater than that at each of the other four stores.

 The dollar amount of sales at Store S for 2008 was 22 percent less than that for 2006.

 The dollar amount of sales at Store R for 2008 was more than 17 percent greater than that for 2006.

Practice Questions
Question: 3
Page: 128
Difficulty: medium/hard
[Reveal] Spoiler: OA

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Re: Based on the information given, which of the following state [#permalink] New post 13 Sep 2017, 12:29
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Explanation


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For Choice A, since the only data given in Figure 8 are percent changes from year to year, there is no way to compare the actual dollar amount of sales at the stores for 2008 or for any other year. Even though Store R had the greatest percent increase from 2006 to 2008, its actual dollar amount of sales for 2008 may have been much smaller than that for any of the other four stores, and therefore Choice A is not necessarily true. For Choice B, even though the sum of the two percent decreases would suggest a 22 percent decrease, the bases of the percents are different. If B is the dollar amount of sales at Store S for 2006, then the dollar amount for 2007 is 93 percent of B, or and the dollar amount for 2008 is given by 0.93B, (0.85)(0.93)B, which is Note that this represents a percent decrease of 0.7905B. percent, which is less than 22 percent, and so Choice B is 100 − 79.05 = 20.95 not true.
For Choice C, if C is the dollar amount of sales at Store R for 2006, then the dollar amount for 2007 is given by and the dollar amount for 2008 is given 1.05C by which is Note that this represents a 17.6 percent (1.12)(1.05)C, 1.176C. the increase, which is greater than 17 percent, so Choice C must be true.

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Re: Based on the information given, which of the following state [#permalink] New post 26 Sep 2017, 07:34
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Attachment:
used_car.jpg


Based on the information given, which of the following statements must be true?

Indicate all such statements.

 For 2008 the dollar amount of sales at Store R was greater than that at each of the other four stores.

 The dollar amount of sales at Store S for 2008 was 22 percent less than that for 2006.

 The dollar amount of sales at Store R for 2008 was more than 17 percent greater than that for 2006.

Practice Questions
Question: 3
Page: 128
Difficulty: medium/hard



There is a mismatch between question and table!
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Re: Based on the information given, which of the following state [#permalink] New post 26 Sep 2017, 10:43
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Thank you so much. Fixed

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Re: Based on the information given, which of the following state [#permalink] New post 27 Sep 2017, 04:34
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Thank you so much. Fixed

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Ok, then the answer is:

 For 2008 the dollar amount of sales at Store R was greater than that at each of the other four stores.

Since we have no information about the dollar amount of sales of each store, we can't say which one is the greatest in 2008. Even though Store R has experienced two consecutive increases, this does not give any information about the actual amount of money that could be even lower than others.

 The dollar amount of sales at Store S for 2008 was 22 percent less than that for 2006.

The percent decrease of sales at Store S is not computed as the sum of the two decreases (-7 - 15), but it is computed as ((1-0.07)(1-0.15)X)-X/X*100, where X is the amount of sales. The result is -20.95% that is different from 22%.

 The dollar amount of sales at Store R for 2008 was more than 17 percent greater than that for 2006.

Here the question says if the increase has been more than 17 percent. Then, using the same formula as above we can compute ((1+0.05)(1+0.12)X-X)/X*100 = 17.6%, which is greater than 17%.

Thus, the answer is C!
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