Security f has an expected return of 12.0 percent and a standard deviation of 45.0 percent per year. security g has an expected return of 17.0 percent and a standard deviation of 64.0 percent per year. a. what is the expected return on a portfolio composed of 20 percent of security f and 80 percent of security g? (do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e. g., 32.16.) b. if the correlation between the returns of security f and security g is .15, what is the standard deviation of the portfolio described in part (a)? (do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e. g., 32.16.)