A survey was sent to 90 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?	Answers:
A) 2% B) 6% C) 14% D) 28% E) 63%
case 1: (7/90)=x/100   x=8%   case 2: (9/63)=y/100   y=14%   So percent increase is =(y-x)=(14-8)= 
<gadget id="calculator">(14-8)</gadget>
<output>6</output>
6%   Answer is 6%
<result>B</result>
A survey was sent to 90 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?