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OG 13 1

This topic has 1 expert reply and 0 member replies
oquiella Master | Next Rank: 500 Posts Default Avatar
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OG 13 1

Post Thu Dec 24, 2015 8:30 am
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    Last month a certain music club offerred a discount to preferred customers. After the first compact disc purchased, preferred customers paid $3.99 for each additional compact disc purchased. If a preferred customer purchased a total of 6 compact disc, then the dollar amount that the customer paid for the 6 compact discs is equivalent to which of the following?

    A. 5(4.00) + 15.90
    B. 5(4.00) + 15.95
    C. 5(4.00) + 16.00
    D. 5(4.00-0.01) + 15.90
    E. 5(4.00-0.05) + 15.95

    Answer: A

    Please explain the easiest way to think about this. I initially chose D.
    This type of problem seems to come up from time to time, please include any extra examples or videos on how to approach this type of problem.

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    Post Thu Dec 24, 2015 9:07 am
    Hi oquiella,

    The prompt that you listed was missing some information. The full prompt is here:

    Last month a certain music club offered a discount to preferred customers. After the first compact disc purchased, preferred customers paid $3.99 for each additional compact disc purchased. If a preferred customer purchased a total of 6 compact discs and paid $15.95 for the first compact disc, then the dollar amount that the customer paid for the 6 compact discs is equivalent to which of the following?

    (A) 5(4.00) + 15.90
    (B) 5(4.00) + 15.95
    (C) 5(4.00) + 16.00
    (D) 5(4.00 - 0.01) + 15.90
    (E) 5(4.00 - 0.05) + 15.95

    Like many GMAT questions, this prompt isn't really about doing lots of math - it's about organizing the information that you're given so that you can avoid doing lots of calculations.

    Notice how the first disc is $15.95? That's $0.05 LESS than $16.
    Notice how the additional discs are all $3.99? That's $0.01 LESS than $4.

    It's interesting that the question tells us that after the first disc is purchased, 5 additional discs are purchases. So that would be $0.05 less than $20. Thinking in these terms ($0.05 'pieces'), the numbers in this prompt are actually pretty easy to combine and simplify.

    GMAT assassins aren't born, they're made,
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