# Bayesian conditional probability question

My girlfriend asked for my help on a probability problem, and I'm kind of stumped. I don't want to let her down so I was hoping I could get a tip. This is the question:

Suppose we have two hypothesis $H_1$ and $H_2$ with disjoint probabilities such that $P(H_1)=0.2$ and $P(H_2)=0.8$ Now we observe an event $E$, which would be unlikely given $H_2$. Specifically, the probability of seeing event $E$ given $H_2$ is 40%, $P(E | H_2)= .4$.