Last year, the market return was 7.3% per year and its standard deviation was 30.4% per year. The risk-free interest rate was 2.2% per year. An investment manager's portfolio generated a rate of return of 8.1% during the year. The portfolio's beta was 0.89 and its return standard deviation was 23.6% per year. What was the portfolio's Treynor ratio? 1) 6.02 2) 6.00 3) 6.41 4) 5.88 5) 6.63