A school has a total enrollment of 90 students. There are 30 students taking ... ...

A school has a total enrollment of 90 students. There are 30 students taking physics, 25 taking English, and 13 taking both. What percentage of the students are taking either physics or English?
(A)    30%
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Nova Math - Problem Set Z: Counting