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m09 Q23

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SVP
Joined: 16 Nov 2010
Posts: 1599

Kudos [?]: 592 [0], given: 36

Location: United States (IN)
Concentration: Strategy, Technology

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17 Apr 2011, 04:55
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.

Opinions ?

Regards,
Subhash
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Formula of Life -> Achievement/Potential = k * Happiness (where k is a constant)

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Kudos [?]: 592 [0], given: 36

Math Forum Moderator
Joined: 20 Dec 2010
Posts: 1964

Kudos [?]: 2050 [0], given: 376

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17 Apr 2011, 05:09
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.

Opinions ?

Regards,
Subhash

True. St1 and St2 are contradictory.
_________________

Kudos [?]: 2050 [0], given: 376

SVP
Joined: 16 Nov 2010
Posts: 1599

Kudos [?]: 592 [0], given: 36

Location: United States (IN)
Concentration: Strategy, Technology

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17 Apr 2011, 05:37
So what should we do for this question ?
_________________

Formula of Life -> Achievement/Potential = k * Happiness (where k is a constant)

GMAT Club Premium Membership - big benefits and savings

Kudos [?]: 592 [0], given: 36

Math Forum Moderator
Joined: 20 Dec 2010
Posts: 1964

Kudos [?]: 2050 [0], given: 376

Show Tags

17 Apr 2011, 06:03
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.
_________________

Kudos [?]: 2050 [0], given: 376

Re: m09 Q23   [#permalink] 17 Apr 2011, 06:03
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m09 Q23

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