Please solving using the box way

Question 1 (4 parts): A study on medical malpractice found that 23% of all doctors had been sued. Of those doctors who had been sued, 20% work for HMOs. Industry statistics show that 30% of all doctors work for HMOs. a. What is the probability that a doctor who had not been sued works for an HMO? b. What is the probability that a doctor who works for an HMO has been sued? c. What is the probability that a doctor who does not work for an HMO has been sued? d. Who will pay higher malpractice insurance, HMO or non-HMO doctors? Why