A survey was sent to 80 customers, 7 of whom responded. Then the survey was redesigned and sent to another 63 customers,

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?

A. 2%
B. 5%
C. 14%
D. 28%
E. 63%

Answer: E

Source: Manhattan GMAT

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