4. (20 points) A new author wants to publish his book for the first time. The publisher has provided him with the following scenarios for the Annual Costs and Sales that he could expect: The scenarios for annual sales and the scenarios for annual costs are completely independent from each other. (a) What is the expected value for annual sales and for annual costs? (b) What is the expected AEW(Annual Equivalent Worth) of this product? (c) What is the probability that the product will have a negative AEW? (Method: by hand. No CDF required.)