Mr. Ellis is a teacher who tutors students after school. Of the students he tutors, 36% need help in computer science and the rest need assistance in math. Of the students who need help in computer science, 50% are enrolled in Mr. Ellis’s class during the school day. Of the students who need help in math, 25% are enrolled in his class during the school day. What percent of the after-school students are enrolled in Mr. Ellis’s classes? Show or explain your work.