20) Portfolios A and B are exposed to only one and the same factor risk. Calculate the expected return of both portfolios based on the given information according to APT model. a. A=10 percent; B=20 percent b. A=22 percent; B=40 percent c. A=15 percent; B=25 percent d. A=23 percent; B=50 percent 21) (Continuation) Assume that portfolio B is underperforming. Which one of the following combinations could best replicate portfolio B' s expected return and risk? a. Borrow two dollars per every one dollar in our budget at the riskfree rate and invest all the funds in portfolio A. b. Borrow two and a half dollars per every one dollar in our budget at the risk-free rate and invest all the funds in portfolio A. c. Borrow one and a half dollars per every one dollar in our budget at the risk-free rate and invest all the funds in portfolio A. d. Borrow half a dollar per every one dollar in our budget at the riskfree rate and invest all the funds in portfolio A