Probability questions~please help!!

Jenna teaches two courses in second semester, MTH1122 and MTH1030. Among

Jenna students 20 percent are MTH1122 students. As a consequence of Jenna’s

teaching technique 10 percent of the MTH1030 students and 5 percent of the MTH1122

students develop an addiction to mathematics (wishful thinking, or course, but...).

a) What is the probability that one of Burkard’s students who has been randomly chosen

is a matheholic?

b) One of Jennas students presents at the doctors with acute symptoms of maths addiction.

What is the probability that this student is an MTH1030 matheholic? Assumptions: A student who takes one course, does not take the other course. There

were no matheholics among the students before Jenna started teaching the course.