In a class of 200 students,forty percent are girls. Twenty-five percent ... ...

In a class of 200 students, forty percent are girls. Twenty-five percent of the boys and 10 percent of the girls signed up for a tour to Washington DC.  What percent of the class signed up for the tour?  
(A)   19%
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Nova Press: Set Q - Percents