Please help me construct a decision tree for this problem. Thanks!

Amy Lloyd is interested in leasing a new Honda and has contacted three automobile dealers for pricing information. Each dealer offered Amy a closed-end 36-month lease with no down payment due at the time of signing. Each lease includes a monthly charge and a mileage allowance. Additional miles receive a surcharge on a per-mile basis. The monthly lease cost, the mileage allowance, and the cost for additional miles follow:

Dealer Monthly Cost Mileage Allowance Cost per Addl Mile

Hepburn Honda $299 36,000 $0.15

Midtown Motors $310 45,000 $0.20

Hopkins Automotive $325 54,000 $0.15

Amy decided to choose the lease option that will minimize her total 36-month cost. The difficulty is that Amy is not sure how many miles she will drive over the next three years. For purposes of this decision, she believes it is reasonable to assume that she will drive 12,000 miles per year, 15,000 miles per year, or 18,000 miles per year. The probabilities that Amy drives 12,000, 15,000, or 18,000 miles per year are 0.5, 0.4, and 0.1 respectively.

1. Construct a decision tree showing the decision alternatives, states of nature (including probabilities), and calculated EV (expected value) for each decision alternative. Use circle, square, and line shapes to create the tree.
2. What would your recommendation be? What other factors (objective or subjective) might influence your recommendation?