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m09 Q23

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Joined: 16 Nov 2010
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m09 Q23 [#permalink] New post 17 Apr 2011, 03:55
Hi

If the price of a mobile phone of model increased by 15% from last year and the price of a mobile phone of model decreased by 25% from last year, is the current price of a mobile phone of model greater than that of a mobile phone of model ?

Last year, the price of a mobile phone of model B was 10 percent greater than that of a mobile phone of model A

Last year, model A cost $10 more than model B


I'm a bit unsure about answer explanation/choices (1) and (2) in this question. I think both the options should give the price of one model > the other one, because in GMAT there is no inconsistency in answers.

Of course, I too got the answer - D, but not feeling accurate about the options.

(1)
A2 = 1.15A1

B2 = 0.75B1

So is A2 > B2 ?

B1 = 1.1A1

B2 = 0.75 * 1.1A1 = 0.825A1

A2 - B2 = 1.15A1 - 0.825A1

(1) is sufficient

(2)

A1 = B1 + 10

B2 = 0.75A1 - 7.5

A2 - B2 = 1.15A1 - 0.75A1 + 7.5 = 0.40A1 + 7.5 (A1 is positive)

Sufficient.

Answer - D


Opinions ?

Regards,
Subhash
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Joined: 20 Dec 2010
Posts: 2046
Followers: 127

Kudos [?]: 931 [0], given: 376

Re: m09 Q23 [#permalink] New post 17 Apr 2011, 04:09
subhashghosh wrote:
Hi

If the price of a mobile phone of model increased by 15% from last year and the price of a mobile phone of model decreased by 25% from last year, is the current price of a mobile phone of model greater than that of a mobile phone of model ?

Last year, the price of a mobile phone of model B was 10 percent greater than that of a mobile phone of model A

Last year, model A cost $10 more than model B


I'm a bit unsure about answer explanation/choices (1) and (2) in this question. I think both the options should give the price of one model > the other one, because in GMAT there is no inconsistency in answers.

Of course, I too got the answer - D, but not feeling accurate about the options.

(1)
A2 = 1.15A1

B2 = 0.75B1

So is A2 > B2 ?

B1 = 1.1A1

B2 = 0.75 * 1.1A1 = 0.825A1

A2 - B2 = 1.15A1 - 0.825A1

(1) is sufficient

(2)

A1 = B1 + 10

B2 = 0.75A1 - 7.5

A2 - B2 = 1.15A1 - 0.75A1 + 7.5 = 0.40A1 + 7.5 (A1 is positive)

Sufficient.

Answer - D


Opinions ?

Regards,
Subhash


True. St1 and St2 are contradictory.
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SVP
SVP
avatar
Joined: 16 Nov 2010
Posts: 1691
Location: United States (IN)
Concentration: Strategy, Technology
Followers: 30

Kudos [?]: 291 [0], given: 36

Premium Member Reviews Badge
Re: m09 Q23 [#permalink] New post 17 Apr 2011, 04:37
So what should we do for this question ?
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Math Forum Moderator
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Joined: 20 Dec 2010
Posts: 2046
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Kudos [?]: 931 [0], given: 376

Re: m09 Q23 [#permalink] New post 17 Apr 2011, 05:03
subhashghosh wrote:
So what should we do for this question ?


Someone will take a look into it and revise/change. Can't tell you how soon. For now; please ignore it.
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Re: m09 Q23   [#permalink] 17 Apr 2011, 05:03
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