A stock has a beta of 1.28 and an expected return of 12.6 percent. A risk-free asset currently earns 4.2 percent. a. What is the expected return on a portfolio that is equally invested in the two assets? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) Expected return b. If a portfolio of the two assets has a beta of 88 , what are the portfolio weights? (Do not round intermediate calculations and round your answers to 4 decimal piaces, e.g., 32.1616.) c. If a portfolio of the two assets has an expected return of 11.8 percent, what is its beta? (Do not round intermediate calculations and round your answer to 2 decimal places, e.g. 32.16.) Beta d. If a portfolio of the two assets has a beta of 2.48, what are the portfolio weights? (A negative answer should be indicated by a minus sign. Do not round intermediate calculations and round your answers to 4 decimal places, e.g., 32.1616.)