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What was the percent increase in the average (arithmetic mean) contrib

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Joined: 02 Sep 2009
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Kudos [?]: 135643 [0], given: 12705

What was the percent increase in the average (arithmetic mean) contrib [#permalink]

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New post 19 Nov 2017, 09:16
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59% (00:49) correct 41% (00:32) wrong based on 27 sessions

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What was the percent increase in the average (arithmetic mean) contribution per member of a certain public radio station from 1985 to 1995 ?

(1) Total contributions by members increased from $505,210 in 1985 to $1,225,890 in 1995.

(2) The number of members exactly doubled from 1985 to 1995.
[Reveal] Spoiler: OA

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Kudos [?]: 135643 [0], given: 12705

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Joined: 20 Feb 2017
Posts: 41

Kudos [?]: 4 [0], given: 435

Re: What was the percent increase in the average (arithmetic mean) contrib [#permalink]

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New post 19 Nov 2017, 09:40
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From statement A
Consider the individual contributions of "n" members be a,b,c,d...n
so total AM is 505210/n
Now total contribution increased to 1225890
therefore new AM is 1225890/n
percentage increase = 42.65% (Assuming the no of members remained same)
but since we don't know anything about the no of members we can't be sure. hence insufficient.
statement 2
Clearly Insufficient.
combining 1 and 2
Sufficient.

Kudos [?]: 4 [0], given: 435

Intern
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Joined: 08 Aug 2017
Posts: 11

Kudos [?]: 1 [0], given: 34

Re: What was the percent increase in the average (arithmetic mean) contrib [#permalink]

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New post 20 Nov 2017, 03:58
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we need both the statements to know about Total contributions and the number of members to figure out % change.
Hence c.

Kudos [?]: 1 [0], given: 34

Re: What was the percent increase in the average (arithmetic mean) contrib   [#permalink] 20 Nov 2017, 03:58
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