stock y has a beta of 1.00 and an expected return of 13.05 percent. stock z has a beta of .60 and an expected return of 8 percent. if the risk-free rate is 5.0 percent and the market risk premium is 7.2 percent, what are the reward-to-risk ratios of y, z and the market? (do not round intermediate calculations. enter your answers as a percent rounded to 2 decimal places.)