In a certain university the probability that a randomly chosen student is an athlete is 0.25. Students who are athletes are twice as likely to take a statistics course as those who are not athletes. What is the conditional probability that a student is an athlete, given that he/she is taking a statistics course? i.e. P(A) = 0.25, P(S|A) = 2P(S|A’). Find P(A|S).