1. You have a stock portfolio that consists of the following positions (price and beta as of 7:40 AM on 10/22/2020): Shares Price Beta Amazon 25 $3,138.71 1.35 Apple 90 $ 115.96 1.31 Tesla 85 $ 429.11 1.69 Costco 75 $ 373.92 0.69 Disney 50 $ 126.25 1.10 (a) What is the portfolio beta? [Hint: You will need to compute the weights for each stock.] (b) If the market return is expected to be 5% and the risk-free rate is 1%, then what is the required rate of return of the portfolio