You are considering investing in a project with the following outcome: Probabilities: Boom: 0.1 Normal: 0.5 Decline: 0.3 Depression: 0.1 Returns: Boom: 12% Normal: 9% Decline: 2% Depression:-10% Calculate the expected rate of return: a.) 6.1% b.) 9.2% c.) 6.75% d.) 5.3%