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landscape--30

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Manager
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landscape--30 [#permalink]

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New post 06 Nov 2008, 10:38
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For each landscaping job that takes more than 4 hours, a certain contractor charges a total of r dollars for the first 4 hours plus 0.2r dollars for each additional hour or fraction of an hour, where r > 100. Did a particular landscaping job take more than 10 hours?
(1) The contractor charged a total of $288 for the job.
(2) The contractor charged a total of 2.4r dollars for the job.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.

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Re: landscape--30 [#permalink]

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New post 07 Nov 2008, 05:18
B.

In stmt1, we do not know the value of R. It can be 200,000 or 101 and accordingly, the number of hours will change.

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Re: landscape--30 [#permalink]

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New post 07 Nov 2008, 05:25
haichao wrote:
For each landscaping job that takes more than 4 hours, a certain contractor charges a total of r dollars for the first 4 hours plus 0.2r dollars for each additional hour or fraction of an hour, where r > 100. Did a particular landscaping job take more than 10 hours?
(1) The contractor charged a total of $288 for the job.
(2) The contractor charged a total of 2.4r dollars for the job.



It has to be B.

question stem --> for first four hours r dollars, for the remaining 0.2r dollar for each hour. Here r>100

(1) $288. Maybe r=101 or 200 or 288 itself. We would never know. Insuff.

(2) 2.4r This means r + 1.4r
so totally 4 + 7 hours. That makes 11 hours. Suff.
_________________

"You have to find it. No one else can find it for you." - Bjorn Borg

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Re: landscape--30 [#permalink]

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New post 07 Nov 2008, 14:14
IMO B

Stat 1 implies
r + (n-4)0.2r=288 ..........one equation two variables
lets put n=11 we get 2.4r=288 => r> 100
lets put n=9 we get 2r=288=> r>100
hence nothing much can be concluded

Stat 2 implies

r + (0.2)7r = 2.4r hence n=11 which is >10

suff

Answer B

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Re: landscape--30   [#permalink] 07 Nov 2008, 14:14
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