Beth just read that 40 years ago, milk was about $1.15 per gallon and today it is about $6 per gallon. She thought that seemed very high, especially if she can only earn 7% from her investments. She also thought that she would need about $3 million for retirement in today's dollars. If inflation is the same in the future as it has been over the last 40 years for a gallon of milk, how much will she need to have accumulated when she retires in 30 years

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?