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# Last year, department A earned 35% more than department B did.

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Intern
Joined: 08 Feb 2016
Posts: 25
Location: Italy
GMAT 1: 730 Q47 V44
Last year, department A earned 35% more than department B did.  [#permalink]

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26 Feb 2016, 02:29
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Difficulty:

55% (hard)

Question Stats:

60% (01:27) correct 40% (01:13) wrong based on 129 sessions

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Last year, department A earned 35% more than department B did. Is department A's earnings this year higher than department B's last year's earnings?

(1) Department B earned \$1,002,035 last year

(2) Department A earned 35% less this year than it did last year
Senior Manager
Joined: 20 Aug 2015
Posts: 386
Location: India
GMAT 1: 760 Q50 V44
Re: Last year, department A earned 35% more than department B did.  [#permalink]

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26 Feb 2016, 04:59
n2223 wrote:
Last year, department A earned 35% more than department B did. Is department A's earnings this year higher than department B's last year's earnings?

(1) Department B earned \$1,002,035 last year

(2) Department A earned 35% less this year than it did last year

Given: Last year Department A earned 35% more than department B
Assume Earning of Department B last year = 100x
Therefore earning of Deprtment A last year = 135x

Required: Is department A's earnings this year higher than department B's last year's earnings

Statement 1: Department B earned \$1,002,035 last year
Nothing can be said about Department A's earning this year.
INSUFFICIENT

Statement 2: Department A earned 35% less this year than it did last year
Earning of Department A this year = 0.65*135x = 87.75x
This is clearly less than the earning of Department B last year.
SUFFICIENT

Option B
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GMAT 1: 760 Q51 V42
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Re: Last year, department A earned 35% more than department B did.  [#permalink]

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28 Feb 2016, 18:04
Forget conventional ways of solving math questions. In DS, Variable approach is the easiest and quickest way to find the answer without actually solving the problem. Remember equal number of variables and independent equations ensures a solution.

Last year, department A earned 35% more than department B did. Is department A's earnings this year higher than department B's last year's earnings?

(1) Department B earned \$1,002,035 last year

(2) Department A earned 35% less this year than it did last year

When you modify the original condition, this question is frequently given on GMAT Math, which is "2 by 2" question like the table below.
Attachment:

GCDS n2223 Last year, department A earned 35 (20160227).jpg [ 23.39 KiB | Viewed 1758 times ]

When you modify the original condition and the question above, they become b>c?. For 2), b>1.35c>c, which is always yes and sufficient.

-> Once we modify the original condition and the question according to the variable approach method 1, we can solve approximately 30% of DS questions.
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Re: Last year, department A earned 35% more than department B did.  [#permalink]

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12 Apr 2016, 14:43
Answer is straightforward option B as we don't get any information from statement 1 B's earning from last year but we get information from statement 2 about A's earning this year
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Re: Last year, department A earned 35% more than department B did.  [#permalink]

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16 Feb 2019, 18:40
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Last year, department A earned 35% more than department B did.   [#permalink] 16 Feb 2019, 18:40
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