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?	Choose one:  A) 2%  B) 5%  C) 14%  D) 28%  E) 63%
case 1: (7/80)=x/100   x=9%   case 2: (9/63)=y/100   y=14%   So percent increase is =(y-x)=(14-9)= 
<gadget id="calculator">(14-9)</gadget>
<output>5</output>
5%   Answer is 5%
<result>B</result>
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?