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

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Math Expert
Joined: 02 Sep 2009
Posts: 50000
What was the percent increase in the average (arithmetic mean) contrib  [#permalink]

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19 Nov 2017, 10:16
00:00

Difficulty:

35% (medium)

Question Stats:

58% (01:14) correct 42% (00:52) wrong based on 38 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.

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Manager
Joined: 20 Feb 2017
Posts: 166
Location: India
Concentration: Operations, Strategy
WE: Engineering (Other)
Re: What was the percent increase in the average (arithmetic mean) contrib  [#permalink]

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19 Nov 2017, 10:40
1
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.
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Intern
Joined: 08 Aug 2017
Posts: 11
Re: What was the percent increase in the average (arithmetic mean) contrib  [#permalink]

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20 Nov 2017, 04:58
1
we need both the statements to know about Total contributions and the number of members to figure out % change.
Hence c.
Re: What was the percent increase in the average (arithmetic mean) contrib &nbs [#permalink] 20 Nov 2017, 04:58
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