Your investment portfolio consists of $18,000 invested in only one stockAmazon. Suppose the risk-free rate is 4%, Amazon stock has an expected return of 11% and a volatility of 38%, and the market portfolio has an expected return of 9% and a volatility of 16%. Under the CAPM assumptions, a. What alternative investment has the lowest possible volatility while having the same expected return as Amazon? What is the volatility of this investment? b. What investment has the highest possible expected return while having the same volatility as Amazon? What is the expected return of this investment? Hint: Make sure to round all intermediate calculations to at least five decimal places. (CH. 11)