A survey was sent to 90 customers, 15 of whom responded. Then the survey was redesigned and sent to another 50 customers, 9 of whom responded. By approximately what percent did the response rate increase from the original survey to the redesigned survey? Options:
A) 2%
B) 5%
C) 8%
D) 28%
E) 63%
Rate of first survey = 15/90   Rate of second survey = 9/50   % Response rate increase (9/50-15/90)/(15/90) = 8%   Answer is 8% = 8%
<result>C</result>
A survey was sent to 90 customers, 15 of whom responded. Then the survey was redesigned and sent to another 50 customers, 9 of whom responded. By approximately what percent did the response rate increase from the original survey to the redesigned survey?