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the survey was redesigned

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by sanju09 » Sat Aug 07, 2010 2:35 am
A survey was sent to 80 customers, 7 of whom responded. Then the survey was redesigned and sent to another 63 customers, 9 of whom responded. By approximately what percent did the response rate increase from the original survey to the redesigned survey?
(A) 2%
(B) 5%
(C) 14%
(D) 28%
(E) 63%

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by kvcpk » Sat Aug 07, 2010 3:28 am
sanju09 wrote:A survey was sent to 80 customers, 7 of whom responded. Then the survey was redesigned and sent to another 63 customers, 9 of whom responded. By approximately what percent did the response rate increase from the original survey to the redesigned survey?
(A) 2%
(B) 5%
(C) 14%
(D) 28%
(E) 63%

Source: MGMAT
80 - 7responded
Response rate = 7/80
63 - 9 responded
Response Rate = 9/63 = 1/7

Perc increase = (1/7-7/80)/7/80 * 100
= 31*80 / (49 * 80) * 100
= 31/49 * 100
approx 63%

pick E
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