Consider historical data showing that the average annual rate of return on the s& p 500 portfolio over the past 85 years has averaged roughly 8% more than the treasury bill return and that the s& p 500 standard deviation has been about 21% per year. assume these values are representative of investors' expectations for future performance and that the current t-bill rate is 4%. calculate the utility levels of each portfolio for an investor with a = 2. assume the utility function is u = e(r) − 0.5 × aσ2. (do not round intermediate calculations. round your answers to 4 decimal places.)