A new medical test has been invented to help doctors find out whether or not someone has got a disease. Experiments have shown that, if a person has the disease, then the test result will always be positive. If a person does not have a disease, then the probability of the test being wrong is 5%. This is called a false positive result. Suppose the test is tried out in two different cities, City A and City B. A sample of 1,000 people is tested from each city. In City A, 20% of the sample has the disease. In City B, only 2% of the sample has the disease. Answer the following questions. Use probability notation when asked to provide a probability and explain all your answers fully.