2010 Pascal Problem 10

The diagram shows a circle graph which shows the amount of homework done each day by Mr. Auckland's Grade 9 class. Based on the circle graph, what percentage of students do at least one hour of homework per day?

\textbf{(A)}\ 25\%\quad \textbf{(B)}\ 33\%\quad \textbf{(C)}\ 50\%\quad \textbf{(D)}\ 67\%\quad \textbf{(E)}\ 75\%

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.