AMC 10A 2009 Problem 18

At Jefferson Summer Camp, 60 \% of the children play soccer, 30 \% of the children swim, and 40 \% of the soccer players swim. To the nearest whole percent, what percent of the non-swimmers play soccer?

Answer Choices
A. 30 \%
B. 40 \%
C. 49 \%
D. 51 \%
E. 70 \%