helene's portfolio produced an actual rate of return of 8.5%. her portfolio has a standard deviation of 5.75% and a beta of 0.95. assuming the market's actual return is 9.65% and the risk-free rate of return is 2.5%, calculate the treynor ratio for her portfolio. a) 0.2000 b) 0.0632 c) 1.0435 d) 0.0289