Bankers Corp

Essay

Bankers Corp.has a very conservative beta of .7,while Biotech Corp.has a beta of 2.1.Given that the T-bill rate is 5%,and the market is expected to return 15%,what is the expected return of Bankers Corp.,Biotech Corp.,and a portfolio composed of 60% of Bankers Corp.and 40% Biotech Corp.?
a.Solve this problem first by weighting the betas to calculate a portfolio beta,and then using CAPM to calculate the portfolio expected return.
b.Then solve the problem again by calculating the expected return of each asset and weighting those returns to calculate the portfolio expected return.
c.Why is Biotech Corp.'s expected return NOT three times that of Bankers Corp.?