It is estimated that, during the past year, 28% of all adults visited a therapist and 43% of all adults used non-prescription antidepressants. It is also estimated that 21% of all adults both visited a therapist and used a non-prescription antidepressant during the past year.

(a) What is the probability that an adult visited a therapist during the past year, given that he or she used non-prescription antidepressants? Round your answer to 2 decimal places.

(b) What is the probability that a randomly selected adult who visited a therapist during the past year also used non-prescription antidepressants? Round your 2 answer to decimal places.