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# In a retail store, the average (arithmetic mean) sale for

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Director
Joined: 23 May 2008
Posts: 757
In a retail store, the average (arithmetic mean) sale for [#permalink]

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07 Oct 2008, 14:38
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In a retail store, the average (arithmetic mean) sale for the month M was d dollars. Was the average (aritmetic mean) sale for month J at least 20 percent higher than that for month M?

1) For month M, total revenue from sales was \$3,500.

2) For month J, total revenue from sales was \$6,000.
Manager
Joined: 27 Sep 2008
Posts: 76
Re: DS: veritas prep retail store [#permalink]

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07 Oct 2008, 15:17

we cannot tell the number of items sold

SVP
Joined: 17 Jun 2008
Posts: 1504
Re: DS: veritas prep retail store [#permalink]

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08 Oct 2008, 01:20
bigtreez, is somthing missing from the question? Average sale is written as dollars without qualifying what this average is for...is this average per item, average per day, etc.?

If it appears on the real GMAT, my choice will obviously be E.
Senior Manager
Joined: 21 Apr 2008
Posts: 477
Schools: Kellogg, MIT, Michigan, Berkeley, Marshall, Mellon
Re: DS: veritas prep retail store [#permalink]

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08 Oct 2008, 05:29
yep, I think the mean should be stated as dollars / something, doesn't it?

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Director
Joined: 23 May 2008
Posts: 757
Re: DS: veritas prep retail store [#permalink]

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08 Oct 2008, 09:33
scthakur wrote:
bigtreez, is somthing missing from the question? Average sale is written as dollars without qualifying what this average is for...is this average per item, average per day, etc.?

If it appears on the real GMAT, my choice will obviously be E.

Thats what threw me off about this question. I assumed average per day when I shouldnt have assumed anything. The answer is E!
Manager
Joined: 11 Mar 2008
Posts: 110
Re: DS: veritas prep retail store [#permalink]

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03 Nov 2008, 15:32
bigtreezl wrote:
scthakur wrote:
bigtreez, is somthing missing from the question? Average sale is written as dollars without qualifying what this average is for...is this average per item, average per day, etc.?

If it appears on the real GMAT, my choice will obviously be E.

Thats what threw me off about this question. I assumed average per day when I shouldnt have assumed anything. The answer is E!

yep, assumed per day and even went a step further calculating monthly averages using 28 and 31 days : )))
Current Student
Joined: 28 Dec 2004
Posts: 3312
Location: New York City
Schools: Wharton'11 HBS'12
Re: DS: veritas prep retail store [#permalink]

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03 Nov 2008, 15:45
i think its E because they want you to realize that a month could have 31 days or 28 days..we dont know..
Manager
Joined: 11 Mar 2008
Posts: 110
Re: DS: veritas prep retail store [#permalink]

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03 Nov 2008, 16:01
fresinha12 wrote:
i think its E because they want you to realize that a month could have 31 days or 28 days..we dont know..

if the question were to ask avg/day then using 28 days as min possible # days and 31 as max possible # of days we could show that at least 20% higher is possible, thus C.

the problem here is that we do not know what type of average we are looking for: avg/day or avg/item or avg/week?
Re: DS: veritas prep retail store   [#permalink] 03 Nov 2008, 16:01
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