A survey was sent to 80 customers, 9 of whom responded. Then the survey was redesigned and sent to another 63 customers, 12 of whom responded. By approximately what percent did the response rate increase from the original survey to the redesigned survey? Choose the most appropriate option:
A) 2% B) 5% C) 14% D) 28% E) 69%
Rate of first survey = 9/80   Rate of second survey = 12/63   % Response rate increase (12/63-9/80)/(9/80) = 69%   Answer is 69% = 69%
<result>E</result>
A survey was sent to 80 customers, 9 of whom responded. Then the survey was redesigned and sent to another 63 customers, 12 of whom responded. By approximately what percent did the response rate increase from the original survey to the redesigned survey?