There are two investment alternatives: First alternative: a treasury bill that generates 6% rate of return with a probability of 1.0. Second alternative: a risky portfolio that either generates 15% rate of return with a probability of 0.6 or 5% with a probability of 0.4. The risk premium (.e. excess return over the risk-free rate) on the risky portfolio (i.e. second alternative) is %. Your answer must be in one digit with no decimal. That is, you answer must be in this format: 5