A survey was sent to 60 customers, 7 of whom responded. Then the survey was redesigned and sent to another 72 customers, 9 of whom responded. By approximately what percent did the response rate increase from the original survey to the redesigned survey? Choose the correct option: A) 2% B) 7% C) 14% D) 28% E) 63%
Rate of first survey = 7/60   Rate of second survey = 9/72   % Response rate increase (9/72-7/60)/(7/60) = 7%   Answer is 7% = 7%
<result>B</result>
A survey was sent to 60 customers, 7 of whom responded. Then the survey was redesigned and sent to another 72 customers, 9 of whom responded. By approximately what percent did the response rate increase from the original survey to the redesigned survey?