Consider a three-factor APT model. The factors and associated risk premiums are: Calculate expected rates of return on the following stocks. The risk-free interest rate is 4.2%. 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 (l.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=1.8) but zero exposure to the other two factors. (Enter yo 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=1.3t energy factor. (The aluminum company is energy-intensive and suffers when energy prices rise.) (Enter your answer as a perc rounded to 2 decimal places.)