A stock has a beta of 8 and an expected return of 12 percent. A risk-free asset currently earns 4.3 percent. a. What is the expected return on a portfolio that is equally invested in the two assets? (Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places.) b. If a portfolio of the two assets has a beta of 71 , what are the portfolio weights? (Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places.) c. If a portfolio of the two assets has an expected return of 8.75 percent, what is its beta? (Do not round intermediate calculations. Round your answer to 4 decimal places.) d. If a portfolio of the two assets has a beta of 1.04, what are the portfolio weights? (A negative value should be indicated by a minus sign. Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places.)