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Each writer for the local newspaper is paid as follows: a dollars for [#permalink]

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13 Dec 2015, 04:36

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1

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A

B

C

D

E

Difficulty:

35% (medium)

Question Stats:

72% (01:31) correct 28% (02:17) wrong based on 105 sessions

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Each writer for the local newspaper is paid as follows: a dollars for each of the first n stories each month, and a + b dollars for each story thereafter, where a > b. How many more dollars will a writer who submits n + a stories in a month earn than a writer who submits n + b stories?

A. (a – b)( a + b + n) B. a – b C. a^2 – b^2 D. n( a – b) E. an + bn – an

Re: Each writer for the local newspaper is paid as follows: a dollars for [#permalink]

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30 May 2017, 05:47

Bunuel wrote:

Each writer for the local newspaper is paid as follows: a dollars for each of the first n stories each month, and a + b dollars for each story thereafter, where a > b. How many more dollars will a writer who submits n + a stories in a month earn than a writer who submits n + b stories?

A. (a – b)( a + b + n) B. a – b C. a^2 – b^2 D. n( a – b) E. an + bn – an

Money earned by a writer who submits n + a stories in a month

a*n + (a+b)*a

Money earned by a writer who submits n + b stories in a month

a*n + (a+b)*b

Difference in their earnings = [a*n + (a+b)*a] - [a*n + (a+b)*b] = (a+b)(a-b) = a^2 - b^2

Answer: option C
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Re: Each writer for the local newspaper is paid as follows: a dollars for [#permalink]

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30 May 2017, 07:32

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Bunuel wrote:

Each writer for the local newspaper is paid as follows: a dollars for each of the first n stories each month, and a + b dollars for each story thereafter, where a > b. How many more dollars will a writer who submits n + a stories in a month earn than a writer who submits n + b stories?

A. (a – b)( a + b + n) B. a – b C. a^2 – b^2 D. n( a – b) E. an + bn – an

These kinds of questions (Variables in the Answer Choices - VIACs) can be answered algebraically or using the INPUT-OUTPUT approach. The two posters above have solved the question algebraically, so let's use the INPUT-OUTPUT approach.

Choose some values for the variables... a = 3 (so, $3 for each of the first n stories) n = 5 (so, $3 for each of the first 5 stories) b = 1 (the number of additional stories beyond 5 stories) a+b = 3+1 = 4 (so, $4 for each story beyond 5 stories)

Writer who submits n + a stories in a month In other words, writer who submits 5 + 3 stories in a month So, TOTAL payment = (5 stories)($3 per story) + (3 stories)($4 per story) = 15 + 12 = $27

Writer who submits n +b stories in a month In other words, writer who submits 5 + 1 stories in a month So, TOTAL payment = (5 stories)($3 per story) + (1 story)($4 per story) = 15 + 4 = $19

How many more dollars will a writer who submits n + a stories in a month earn than a writer who submits n + b stories? $27 - $19 = $8

So, when a = 3, n = 5 and b = 1, the answer to the question is $8 In other words, when we INPUT a = 3, n = 5 and b = 1, the OUTPUT is 8

Now we'll test each answer choice by plugging in a = 3, n = 5 and b = 1 to see which one yields an OUTPUT of 8

A. (3 – 1)( 3 + 1 + 5) = 18 (no match...ELIMINATE) B. 3 – 1 = 2 (no match...ELIMINATE) C. 3^2 – 1^2 = 8 (a match...KEEP) D. 5( 3 – 1) = 10 (no match...ELIMINATE) E. (3)(5) + (1)(5) – (3)(5) = 5 (no match...ELIMINATE)

Re: Each writer for the local newspaper is paid as follows: a dollars for [#permalink]

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01 Jun 2017, 10:09

Bunuel wrote:

Each writer for the local newspaper is paid as follows: a dollars for each of the first n stories each month, and a + b dollars for each story thereafter, where a > b. How many more dollars will a writer who submits n + a stories in a month earn than a writer who submits n + b stories?

A. (a – b)( a + b + n) B. a – b C. a^2 – b^2 D. n( a – b) E. an + bn – an

We will calculate the earnings of the writers separately.

The writer who writes n + a stories:

For the first n stories, the writer makes a dollars each, earning na dollars in total. For the remaining (n + a) - n = a stories, the writer makes a + b dollars each, earning a(a + b) dollars in total. Thus, for the n + a stories, this writer makes na + a(a + b) dollars.

The writer who writes n + b stories:

Similar to the previous case, this writer makes na dollars for the first n stories. For the remaining (n + b) - n = b stories, which earn a + b dollars each, this writer makes b(a + b) dollars. In total, the writer makes na + b(a + b) dollars.

Now that we have the earnings of each writer, we simply need to determine the difference between the two.

na + a(a + b) - [na + b(a + b)]

na + a(a + b) - na - b(a + b)

a(a + b) - b(a + b)

(a - b)(a + b) = a^2 - b^2

The writer who writes n + a stories makes a^2 - b^2 dollars more than the writer who writes n + b stories.

Answer: C
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Re: Each writer for the local newspaper is paid as follows: a dollars for [#permalink]

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30 Jun 2018, 03:29

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