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GRE Math Challenge #99-What is the cost, in cents, of using

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GMAT Club Legend
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Joined: 07 Jun 2014
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GRE Math Challenge #99-What is the cost, in cents, of using [#permalink] New post 09 May 2015, 11:52
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Question Stats:

100% (00:00) correct 0% (00:00) wrong based on 1 sessions
What is the cost, in cents, of using a certain fax machine to send n pages of a report if the total cost for sending the first k pagers is r cents and the cost for sending each additional page is s cents?
(Assume that n > k.)

(A) r + s (n - k)
(B) r + s (n + k)
(C) rs(n + k)
(D) kr + s(n - k)
(E) kr + ns
[Reveal] Spoiler: OA

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Re: GRE Math Challenge #99-What is the cost, in cents, of using [#permalink] New post 21 Mar 2017, 13:50
Can anyone please guide how to solve this problem?

Thank you!
GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jun 2014
Posts: 4710
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
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Kudos [?]: 1613 [0], given: 375

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Re: GRE Math Challenge #99-What is the cost, in cents, of using [#permalink] New post 22 Mar 2017, 22:19
Expert's post
Explanation

Total number of pages = n

Cost for sending the first k pages = r cents.

Number of pages left after sending k pages = (n - k) pages

Cost to send a single page after first k pages = s cents

Cost for sending the (n - k) pages = s(n - k) cents .

Total cost of first k pages and (n -k) pages = r + s (n - k) cents

Hence option A is correct.
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Re: GRE Math Challenge #99-What is the cost, in cents, of using   [#permalink] 22 Mar 2017, 22:19
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GRE Math Challenge #99-What is the cost, in cents, of using

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