Consider the following information: Rate of Return if State Occurs State of Economy Probability of State of Economy Stock A Stock B Stock C Boom 0.72 0.19 0.23 0.17 Bust 0.28 0.07 0.09 -0.03 a. What is the expected return on an equally weighted portfolio of these three stocks? b. What is the variance of a portfolio invested 10 percent each in A and B and 80 percent in C?