7. Suppose Johnson & Johnson and the Walgreen Company have expected returns and volatilities shown below, with a correlation of 22%. ELR 7% 10% SDIR 16% 20% Johnson & Johnsorn Walgreen Company (a) Calculate the expected return and the volatility (standard deviation) of a portfolio that is equally invested in Johnson & Johnson's and Walgreen's stock. (b) For the portfolio in (a), if the correlation between Johnson & Johnson's and Walgreen's stock were to increase, would the volatility of the portfolio rise or fall? (c) Calculate the expected return and the volatility (standard deviation) of a portfolio that consists of a long position of $10,000 in Johnson & Johnson and a short position of $2000 in Walgreen's