Mr Ashik's, portfolio manager of Lanka Bangla Investment Company, has created a diversified portfolio using the following stocks. Mr Ashik's risk aversion score is 4. Currently a 3-months Treasury bill offers 6% but he does not have any investment in risk free asset. Expected return and standard deviation of each stock are given below: Stock Market Value (Million BDT) E(R) (%) Standard Deviation 0;(%) Portfolio Variance (02) Beximco 14 5 4 15,000 BSCCL -4 8 17,000 Square Pharma 18 40 2.85% 32,000 ADNTEL 16 13 23,000 Hakkani Pulp 12 15 7,000 Mr Ashik is considering to diversify his portfolio by including a risk-free asset in his portfolio. What proportion of his investment should be in risk-free asset considering his risk aversion score