Danny is an associate with Valley Chartered Accounts in New York. Among various other work commitments, Danny has to file the tax returns of Emerald Builders, an important client. It is a job with heavy workload and a short turnaround deadline. Sam, Danny's colleague, observed this stressful situation and volunteered to assist Danny in meeting the deadline. The support received by Danny can be best described as:

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?