You would like to combine a risky stock with a beta of 1.65 with U.S. Treasury bills in such a way that the risk level of the portfolio is equivalent to the risk level of the overall market. What percentage of the portfolio should be invested in the risky stock? ____% Instruction: Enter your response as a percentage with two decimal places. For example, if your answer is 0.1213=12.13%, please only enter "12.13", please do not enter "0.1213" or "12.13%", the system may not recognize the % sign. You may put negative signs if necessary,