you have a total of $100,000 to invest in a portfolio of assets. the portfolio is composed of a risky asset t with an expected rate of return of 12% and a standard deviation of 18% and a treasury bill (i.e. risk-free asset) with a rate of return of 6%. how much money should be invested in the risky asset t to form a portfolio with a standard deviation of 8%? (hint: find wt)
