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Jim Broke’s only source of income comes from his job as a qu

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Jim Broke’s only source of income comes from his job as a qu [#permalink]

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New post 20 Nov 2011, 05:44
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A
B
C
D
E

Difficulty:

  75% (hard)

Question Stats:

64% (03:25) correct 36% (03:00) wrong based on 147 sessions

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Jim Broke’s only source of income comes from his job as a question writer. In this capacity, Jim earns a flat salary of $200 per week plus a fee of $9 for every question that he writes. Every year, Jim takes exactly two weeks of unpaid vacation to visit his uncle, a monk in Tibet, and get inspired for the next year. If a regular year consists of 52 weeks and the number of questions that Jim wrote in each of the past 5 years was an odd number greater than 20, which of the following could be Jim’s median annual income over the past 5 years?

(A) $22,474
(B) $25,673
(C) $27,318
(D) $28,423
(E) $31,227

[Reveal] Spoiler:
Ok - as the OA is not provided for this questions this is how I tried to solve it, but got stuck and didn't complete.

Regular year has 52 weeks, so total number of weeks = 260
Total week's that Jim takes off = 10
Total number of weeks he worked = 250

Let's say Jim wrote 21 questions per year, so in total he wrote = 105 questions.
Therefore, income from questions = 105 * 9 = 945
Normal income = 200 * 250 = 50, 000

I am struggling to solve after this. Can someone please help?
[Reveal] Spoiler: OA

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Re: Jim's Income [#permalink]

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New post 20 Nov 2011, 11:39
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Jim works 50 weeks per year (52-2). Therefore, he's income in a particular year is 50*200+9*(# of questions) = 10,000 + 9*(# of questions) and # of questions is odd.

Since they are asking for a median (as opposed to mean), the answer must be one of the actual incomes.

9 * odd number of questions is odd. So you can immediately cross out A and C.

Out of the remaining choices:

Income = 10,000 9 * # of questions
Income - 10,000 = 9 * # of questions

Since # of questions is an integer, (Income - 10,000) must be divisible by 9. Divisibility by 9 is easy to test, so you subtract 10,000 from B, D, and E, and see which result is divisible by 9.

The answer is D. (28,423-10,000) = 18,423 is the only one divisible by 9.
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Re: Jim's Income [#permalink]

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New post 20 Nov 2011, 22:18
Great explanation Kostyan. Much appreciated.
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Re: Jim's Income [#permalink]

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New post 19 Sep 2013, 00:51
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Re: Jim Broke’s only source of income comes from his job as a qu [#permalink]

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New post 20 Nov 2014, 09:29
Hello from the GMAT Club BumpBot!

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Jim Broke’s only source of income comes from his job as a qu [#permalink]

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Okay u just need less than one min to answer this question. any odd number greater than 20 means that that last digit must be 1,3,5,7, or 9. 9$ per week for every question. So (odd)(odd) will give odd digit. A and C out. (50 weeks) (200) = 10,000. subtract this amount from option A, D and E and u will find that only option D is divisible by 9 (once 10,000 is subtracted from 28423) so its the right choice..No mathematics..:)
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Jim Broke’s only source of income comes from his job as a qu [#permalink]

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New post 25 Sep 2015, 06:27
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Not so calculation intensive if we just invest a few seconds in planning:

Step 1:
We will get following equation: Total Salary = 52 * $200 - 2*$200 + 9 * (some odd number > 20)

With little simplification we got Total Salary = $10,000 + 9 * (some odd number > 20)


Step 2 (planning):
We can deduce from above equation and available answer choices that calculation is going to be stingy so let's try backtrack from given options.

Now let's eliminate.

Trick 1: For a number to be divisible by 9, sum of all the digits must be equal to 9.
Trick 2: 9 (odd) * some odd number => Last digit must be an odd number

Step 3 (Elimination):
To apply trick 1, we have to decrease ten thousands place number with 1 (Total salary - 10,000) and then do divisibility test. This will eliminate B,C and E.

Trick 2 will eliminate A and C.

Only option that we are left with is D.
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Re: Jim Broke’s only source of income comes from his job as a qu [#permalink]

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New post 25 Sep 2015, 10:24
it took me more than 4 minutes to solve this question.Is it too long ?
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Re: Jim Broke’s only source of income comes from his job as a qu [#permalink]

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New post 25 Sep 2015, 11:17
Thought this question is not that calculation intensive, figuring out the tricks might take sometime. To increase up speed for such questions, in my opinion, try to solve MGMAT Quant Advanced Strategy Guide.

bdw this question took 2:17 for me.

vinnisatija wrote:
it took me more than 4 minutes to solve this question.Is it too long ?


Hope it helps :)
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Re: Jim Broke’s only source of income comes from his job as a qu   [#permalink] 25 Sep 2015, 11:17
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