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DS variables

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karthikpandian19 GMAT Titan
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DS variables Post Thu Jun 07, 2012 10:51 pm
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  • Lap #[LAPCOUNT] ([LAPTIME])
    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 then it did last year

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    Anurag@Gurome GMAT Instructor
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    Post Thu Jun 07, 2012 11:25 pm
    karthikpandian19 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 then it did last year
    Statement 1: No information about A's earnings in this year ---> Not sufficient

    Statement 2: No information about B's earnings in last year ---> Not sufficient

    1 & 2 Together: From statement 1, we know B's earnings in last year.
    From statement 2 and question stem we can determine A's earning in this year.
    Hence, we can determine whether A's earning in this year is higher than B's earnings in last year or not.

    Sufficient

    The correct answer is C.

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    karthikpandian19 GMAT Titan
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    Post Fri Jun 08, 2012 12:07 am
    OA is B
    Anurag@Gurome wrote:
    karthikpandian19 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 then it did last year
    Statement 1: No information about A's earnings in this year ---> Not sufficient

    Statement 2: No information about B's earnings in last year ---> Not sufficient

    1 & 2 Together: From statement 1, we know B's earnings in last year.
    From statement 2 and question stem we can determine A's earning in this year.
    Hence, we can determine whether A's earning in this year is higher than B's earnings in last year or not.

    Sufficient

    The correct answer is C.

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    Last edited by karthikpandian19 on Fri Jun 08, 2012 3:15 pm; edited 1 time in total

    Ashujain Really wants to Beat The GMAT!
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    Post Fri Jun 08, 2012 6:19 am
    Why is B wrong?

    Lets assume B's last year income = B
    Then A's last year income = 1.35B
    And A's income this year = 0.65 * 1.35 B (as per statement 2) = 0.8775 B

    Therefore, statement 2 is sufficient as it provides a definite answer that A's this year income is less than B's last year income.

    Kindly correct me if I am wrong.

    khandelwal.ab Just gettin' started! Default Avatar
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    Post Fri Jun 08, 2012 6:46 am
    I dont understand why B is not the answer...

    Statement2-> department a earned 35% less this year then it did last year.

    Information we have using the stem and statement 2 alone:

    Earnings of B last year- b (b is an unknown variable)
    Earnings of A last year- 1.35b
    Earnings of A this year- 1.35b-(1.35b*0.35)= 0.877b

    0.877b<b.... hence B is sufficient..

    please let me know if I am missing something here.

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    Post Fri Jun 08, 2012 8:39 am
    khandelwal.ab wrote:
    I dont understand why B is not the answer...

    Statement2-> department a earned 35% less this year then it did last year.

    Information we have using the stem and statement 2 alone:

    Earnings of B last year- b (b is an unknown variable)
    Earnings of A last year- 1.35b
    Earnings of A this year- 1.35b-(1.35b*0.35)= 0.877b

    0.877b<b.... hence B is sufficient..

    please let me know if I am missing something here.
    khandelwal.ab, Ashujain: You guys are both right. The OA provided is wrong. It should be B.
    In option (1), what B earned last year actually adds no useful information to the question.

    As you guys have pointed out, from the question stem, we know that A(last year)= 1.35*b(last year).
    And option (2) is A(this year) = 0.65* A(last year) = 0.65*1.35*b(last year) = 0.8775*b(last year).
    Clearly, we can tell that A earned less this year than what B earned last year.

    karthikpandian19, please correct the OA to be B.

    Let me know if this helps Smile

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    karthikpandian19 GMAT Titan
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    Post Fri Jun 08, 2012 3:15 pm
    done
    eagleeye wrote:
    khandelwal.ab wrote:
    I dont understand why B is not the answer...

    Statement2-> department a earned 35% less this year then it did last year.

    Information we have using the stem and statement 2 alone:

    Earnings of B last year- b (b is an unknown variable)
    Earnings of A last year- 1.35b
    Earnings of A this year- 1.35b-(1.35b*0.35)= 0.877b

    0.877b<b.... hence B is sufficient..

    please let me know if I am missing something here.
    khandelwal.ab, Ashujain: You guys are both right. The OA provided is wrong. It should be B.
    In option (1), what B earned last year actually adds no useful information to the question.

    As you guys have pointed out, from the question stem, we know that A(last year)= 1.35*b(last year).
    And option (2) is A(this year) = 0.65* A(last year) = 0.65*1.35*b(last year) = 0.8775*b(last year).
    Clearly, we can tell that A earned less this year than what B earned last year.

    karthikpandian19, please correct the OA to be B.

    Let me know if this helps Smile

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    eagleeye GMAT Destroyer!
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    Post Fri Jun 08, 2012 5:56 pm
    Thanks karthikpandian19. Smile

    ronnie1985 GMAT Destroyer!
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    Post Sat Jun 09, 2012 11:48 am
    A = 1.35*B

    S1:B=given value. No info about A next year. NS

    S2: A = 0.65*1.35B = (x)B x is known. Suff to answer a yes or no

    (B)

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    bubbliiiiiiii GMAT Destroyer!
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    Post Mon Jun 11, 2012 4:25 am
    +1 for B.

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