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By what percent the sales revenue of Company X increased from 2001 to

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By what percent the sales revenue of Company X increased from 2001 to  [#permalink]

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New post 11 Oct 2018, 04:13
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A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

60% (01:08) correct 40% (01:05) wrong based on 55 sessions

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By what percent the sales revenue of Company X increased from 2001 to 2005?


(1) In each of the two years, 2001 and 2005, the sales revenue of Company X was 20 percent of the total sales revenue of the industry in that year.

(2) In 2005, the total sales revenue of the industry was 20 percent more than that in 2001.

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By what percent the sales revenue of Company X increased from 2001 to  [#permalink]

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New post 11 Oct 2018, 05:55
The answer is C.

(1) without knowing how the industry changed in this period, this tells us nothing about how X changed.
(2) without knowing anything about the relationship between company Y and the industry, this is meaningless. insufficient

Combined:
Let's say the industry's revenue was y in 2001, making it 1.2y in 2005 (according to (2)). (1) tells us that company X's revenue was 0.2y in 2001 and 0.2*1.2y=0.24y in 2005. the growth from 0.2 to 0.24 is 0.04/0.2=0.2=20%
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By what percent the sales revenue of Company X increased from 2001 to   [#permalink] 11 Oct 2018, 05:55
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