The following question illustrates the APT. Imagine that there are only two pervasive macroeconomic factors. Investments X,Y, and Z have the following sensitivities to these two factors: We assume that the expected risk premium is 5.5% on factor 1 and 9.5% on factor 2 . Treasury bills obviously offer zero risk premium. a. According to the APT, what is the risk premium on each of the three stocks? b. Suppose you buy $320 of X and $80 of Y and sell $240 of Z. What is the sensitivity of your portfolio to each of the two factors? What is the expected risk premium? c. Suppose you buy $128 of X and $96 of Y and sell $64 of Z. What is the sensitivity of your portfolio to each of the two factors? What is the expected risk premium? d. Finally, suppose you buy $256 of X and $32 of Y and sell $128 of Z. What is your portfolio's sensitivity now to each of the two factors? And what is the expected risk premium? Complete this question by entering your answers in the tabs below. According to the APT, what is the risk premium on each of the three stocks? (Enter your answers as a percent rounded to 2 decimal places.)