Consider a three-factor APT model. The factors and associated risk premiums are: Risk Premium (%) Factor Change in gross national product (GNP) Change in energy prices Change in long-term interest rates +6.4 0.6 +2.8 Calculate expected rates of return on the following stocks. The risk-free interest rate is 6.5% a. A stock whose return is uncorrelated with all three factors. (Enter your answer as a percent rounded to 1 decimal place.) b. A stock with average exposure to each factor (i.e., with b 1 for each). (Enter your answer as a percent rounded to 1 decimal place.) c. A pure-play energy stock with high exposure to the energy factor (b 2.5) but zero exposure to the other two factors. (Enter your answer as a percent rounded to 2 decimal places.) d. An aluminum company stock with average sensitivity to changes in interest rates and GNP, but negative exposure of b-1.6 to the energy factor. (The aluminum company is energy-intensive and suffers when energy prices rise.) (Enter your answer as a percent rounded to 2 decimal places.) Expected rate of return . % b. Expected rate of return Expected rate of return Expected rate of return % C. d