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Delivery Cost (gmatprep)

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Delivery Cost (gmatprep)

by Bhupisuhag » Sat Jun 30, 2012 4:13 am
The cost of delivery of an order of desk chairs was $1000 for the first chair, and $1000 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 totaled more than $30.00
(2) The average (arithmetic mean) delivery cost per chair of the n chairs was $1.36.
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Source: — Data Sufficiency |

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by Anurag@Gurome » Sat Jun 30, 2012 4:19 am
According to what you have posted statement 1 is redundant and statement 2 is impossible.
The correct version of the question is as follows...
Bhupisuhag wrote:The cost of delivery of an order of desk chairs was $10 for the first chair, and $1 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 totaled more than $30.00
(2) The average (arithmetic mean) delivery cost per chair of the n chairs was $1.36.
The delivery cost of n chairs = $[10 + (n - 1)] = $(n + 9)

Statement 1: (n + 9) > 30 ---> n > 21

Not sufficient

Statement 2: (n + 9)/n = 1.36
So, (n + 9) = 1.36n
We can solve for n and determine whether n > 24 or not.

Sufficient

The correct answer is B.
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by sandeep_thaparianz » Sat Jun 30, 2012 5:00 am
was suspecting the question to be wrong..
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