Quantitative report

Am stuck with on the following question, anyone that can please help.

An oil company is considering whether or not to bid for an offshore &Wing contract. The bid would cost $60m with a 65% chance of gaining the contract. The company may set up a new drilling operation or move its already existing operation, which has proved successful, to a new site. The probability of success and expected returns are as follows:

New Operation Move Existing Operation
Outcome Probability Expected Return ($m) Probability Expected Return ($m)
Success 0.7 80 0.8 70
Failure 0.3 20 0.2 30
Should company not bid or be unsuccessful in its bid, they can use the $60m to modernize their operations. This would result in a return of either 5% or 10% on the sum invested with probabilities 0.4 and 0.6 respectively.

With the aid of decision tree prepare a quantitative report advising the company on the optimal course of action.