A survey was sent to 65 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?
Choose the correct option: A) 2% B) 4% C) 14% D) 28% E) 63%
case 1: (7/65)=x/100   x=10%   case 2: (9/63)=y/100   y=14%   So percent increase is =(y-x)=(14-10)= 
<gadget id="calculator">(14-10)</gadget>
<output>4</output>
4%   Answer is 4%
<result>B</result>
A survey was sent to 65 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?