An investors invests in a combination of the market portfolio and the risk-free asset. The expected return and standard deviation for the market portfolio are 15% and 31%. The risk-free rate is 3%. If the standard deviation for this portfolio is 30%, what is the weight of the risk-free asset in this portfolio? (Note, please retain at least 4 decimal places in your calculations and at least 2 decimal places in your final answer.) % of his wealth in the risk-free asset. The investor invests