How to calculate the expected value for this decision tree?

What would be the expected value for the In-house development?

esueon $25 M Patent awarded 0.7 High $55 M $2 M In-house 0.25 0.3 $10 M Medium Yes Patent not awarded $33 M 0.55 Low $15 M 0.20 Continue Development No Figure 2: Decision tree for development of new promising technology. Costs are mentioned in red