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Mail order bookseller - GMAT prep

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by GMATGuruNY » Tue Jan 25, 2011 3:37 am
ashforgmat wrote:For each order, a mail order bookseller charges a fixed processing fee and an additional shipping fee for each book in the order. Rajeev placed five different orders with this bookseller - an order for 1 book in January, an order for 2 books in February, an order for 3 books in March, an order for 4 books in April, and an order for 5 books in May. What was the total of Rajeev's processing and shipping fee for these five orders?

1) Rajeev's processing and shipping fees were $1 more for his order in March than for his order in January
2) The total of Rajeev's shipping fees for the five orders was $7.50
Let P = processing fee, S = shipping fee per book.

Statement 1:
Total in March = P + 3S
Total in January = P + S
Since the March total is $1 more than the January total, we get:
P + 3S = P + S + 1
2S = 1
S = .5
No information about P.
Insufficient.

Statement 2:
Total shipping fees for 15 books = 15S
Thus, 15S = 7.50.
S = .5
No information about P.
Insufficient.

Statements 1 and 2:
No information about P.
Insufficient.

The correct answer is E.
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by eyelikecheese » Tue Jan 25, 2011 11:07 am
Is the only reason we know this to be (E) is because the processing fee is NOT fixed?

So if the processing fee was fixed, it would be (C)?
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by GMATGuruNY » Tue Jan 25, 2011 11:30 am
eyelikecheese wrote:Is the only reason we know this to be (E) is because the processing fee is NOT fixed?

So if the processing fee was fixed, it would be (C)?
The processing fee could be any value, so there's no way to determine the cost of shipping all the books.
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by Tani » Tue Jan 25, 2011 12:17 pm
both clues give us the same information = the value of the shipping fee per book. We have no information to find the processing fee.
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by buckrich » Tue Jan 25, 2011 11:02 pm
I'm not sure I agree with the wording of this question. Shouldn't (1) mean the processing and shipping fees combined in March is $1 more than in January? Thus, meaning if the shipping fee is .50 per book (2) and the total for the processing and shipping of 3 books is $1 more than 1 book and the processing fee is zero?
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by Tani » Wed Jan 26, 2011 10:02 pm
The processing fee is fixed, so the $1 difference has to be the shipping only for the difference between 3 books and 1 book. The processing fee could be $5.00 or 5 cents. We don't know.
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by buckrich » Thu Jan 27, 2011 5:01 pm
Thanks, I think I understand the question now and was confused because I was thinking both fees were fixed thus giving us a ratio that we could use to get the answer.
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