2008 Pascal Problem 11

At Mathville Junior High School, 30 boys and 20 girls wrote the Pascal Contest. Certificates were awarded to 30% of the boys and 40% of the girls. What percentage of all of the participating students received certificates?

\textbf{(A)}\ 34\quad \textbf{(B)}\ 35\quad \textbf{(C)}\ 36\quad \textbf{(D)}\ 17\quad \textbf{(E)}\ 70

If there are no answer choices shown, enter a numerical answer.

Full credit to this problem is given to the CEMC, you may view all Pascal contests here.