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9 changes in the value of imports between consecutive

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GMAT Club Legend
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Joined: 07 Jun 2014
Posts: 4749
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
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Kudos [?]: 1657 [0], given: 396

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9 changes in the value of imports between consecutive [#permalink] New post 10 Jan 2016, 15:49
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Question Stats:

50% (01:27) correct 50% (01:58) wrong based on 6 sessions
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Which of the following is closest to the average (arithmetic mean) of the 9 changes in the value of imports between consecutive years from 2000 to
2009 ?

A $260 million
B $320 million
C $400 million
D $480 million
E $640 million


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Question: 5
Page: 163
Difficulty: medium

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GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jun 2014
Posts: 4749
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 93

Kudos [?]: 1657 [0], given: 396

CAT Tests
Re: 9 changes in the value of imports between consecutive [#permalink] New post 10 Jan 2016, 16:16
Expert's post
Solution

Now the object is to find the average of 9 changes from 2000 to 2009. Which can also be defined as average change between 2000 to 2009.

So in year 2000: $3.3 Billion

and year 2009: $9 Billion.

Average change per year = \(\frac{($9 - $3.3)}{9}\) = $640 million Approx
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Sandy
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