Ihad a full time job this summer where i earned $10 per hour. it costs me about $4 in gas money for every round trip to and from campus, which lasts for one hour. my class meets once a week and lasts 3 hours. my opportunity cost (including both direct and indirect costs) of attending class in any given week is:

Anew 2-lane road is needed in a part of town that is growing. at some point the road will need 4 lanes to handle the anticipated traffic. if the city's optimistic estimate of growth is used, the expansion will be needed in 4 years and has a probability of happening of 40%. for the most likely and pessimistic estimates, the expansion will be needed in 8 and 15 years respectively. the probability of the pessimistic estimate happening is 20%. the expansion will cost $ 4.2 million and the interest rate is 8%. what is the expected pw the expansion will cost?