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The cost of delivery for an order of desk chairs was $10.00

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VP
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The cost of delivery for an order of desk chairs was $10.00 [#permalink] New post 11 Mar 2008, 22:24
The cost of delivery for an order of desk chairs was $10.00 for the first chair,
and $1.00 for each additional chair in the order. If an office manager placed an
order for n desk chairs, is n > 24 ?

(1) The delivery cost for the order totalled more than $30.00.
(2) The average (arithmetic mean) delivery cost of the n chairs was $1.36.
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Re: gprep inequalities [#permalink] New post 12 Mar 2008, 07:08
Answer is D.

Statement 1;
Tells us total delivery cost is $30.
So for first chair = 10 and remaining 20 chairs = 20 => Total chairs 1 + 20 = 21
So question can be answered by this statement alone.

Statement 2;
Tells us average delivery cost of all chairs = 1.36
10 + (n-1)*1/n = 1.36 => n = 25
So question can be answered with this alone as well.

Do not worry if both options are giving different results, point to note here is that both can provide us the answer.
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Re: gprep inequalities [#permalink] New post 14 Mar 2008, 02:34
abhijit_sen wrote:
Answer is D.

Statement 1;
Tells us total delivery cost is $30.
So for first chair = 10 and remaining 20 chairs = 20 => Total chairs 1 + 20 = 21
So question can be answered by this statement alone.

Statement 2;
Tells us average delivery cost of all chairs = 1.36
10 + (n-1)*1/n = 1.36 => n = 25
So question can be answered with this alone as well.

Do not worry if both options are giving different results, point to note here is that both can provide us the answer.



OA is B.
1 says only that 10+(n-1)>30 and that n>21. so we don't know whether n>24.
Re: gprep inequalities   [#permalink] 14 Mar 2008, 02:34
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The cost of delivery for an order of desk chairs was $10.00

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