It is estimated that 7.18% of people in China are Hepatitis B Virus (HBV) carriers. The human body is usually able to successfully fight HBV, but still 0.5% of Hepatitis B virus carriers will develop liver cancer, while the probability is only 0.005% for people not infected with HBV. a) Suppose that we choose a person at random. What is the probability that this person has liver cancer? b) Suppose that among those people who have been diagnosed with liver cancer, we randomly select one. What is the probability that this person is a HBV carrier