Consider the single factor APT. Portfolio A has a beta of 1.8 and an expected return of 21%. Portfolio B has a beta of .8 and an expected return of 21%. The risk-free rate of return is 12%. If you wanted to take advantage of an arbitrage opportunity, you should take a short position in portfolio and a long position in portfolio . A: A;A
B: A;B
C: B;B
D: B;A

Quick calculate the roi dollar amount and percentage for these example investments. a. you invest $50 in a government bond that says you can redeem it a year later for $55. use the instructions in lesson 3 to calculate the roi dollar amount and percentage. (3.0 points) tip: subtract the initial investment from the total return to get the roi dollar amount. then divide the roi dollar amount by the initial investment, and multiply that number by 100 to get the percentage. b. you invest $200 in stocks and sell them one year later for $230. use the instructions in lesson 3 to calculate the roi dollar amount and percentage. (3.0 points) tip: subtract the initial investment from the total return to get the roi dollar amount. then divide the roi dollar amount by the initial investment, and multiply that number by 100 to get the percentage.