A stock has a beta of 7 and an expected return of 11 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. Enter your answer as a percent rounded to 2 decimal places.) Expected return 7.60% b. If a portfolio of the two assets has a beta of.64, what are the portfolio weights? (Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places.) Portfolio Weight % Stock Risk-free asset % c. If a portfolio of the two assets has an expected return of 8.50 percent, what is its beta? (Do not round intermediate calculations. Round your answer to 4 decimal places.) Beta s d. If a portfolio of the two assets has a beta of 1.07, 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.) Stock Risk-free asset Portfolio Weight % %