stock y has a beta of 1.25 and an expected return of 15.05 percent. stock z has a beta of .60 and an expected return of 8 percent. if the risk-free rate is 4.0 percent and the market risk premium is 8.2 percent, what are the reward-to-risk ratios of y and z? (do not round intermediate calculations. enter your answers as a percent rounded to 2 decimal places.)