2002 Gauss 8 Problem 9

The bar graph below shows the numbers of boys and girls in Mrs. Kuwabara's class. The percentage of students in the class who are girls is

\textbf{(A)}\ 40\%\quad \textbf{(B)}\ 15\%\quad \textbf{(C)}\ 25\%\quad \textbf{(D)}\ 10\%\quad \textbf{(E)}\ 60\%

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 Gauss contests here.