investor is forming a portfolio by investing $$50,000$ in stock A that has a beta of $1\mathrm{.}50,$ and $$25,000$ in stock B that has a beta of $0\mathrm{.}90.$ The market risk premium is equal to $6\%,$ and Treasury bonds have a yield of $4\%.$ What is the required rate of return on the investor's portfolio?ons$6\mathrm{.}8\%6\mathrm{.}6\%11\mathrm{.}8\%7\mathrm{.}0\%7\mathrm{.}5\%$