Titan Mining Corporation has $7\mathrm{.}5$ million shares of common stock outstanding, and $140,000$ bonds with a semiannual coupon of $5\%$ outstanding, par value $$1,000$ each. The common stock currently sells for $$50$ per share and has a beta of $1\mathrm{.}5,$ and the bonds have $25$ years to maturity and sell for $105\%$ of par. The market risk premium is $7\mathrm{.}5\%,$ T$-$bills are yielding $2\mathrm{.}4\%,$ and the company$$s tax rate is $22\%.$ What is the rate the firm should use to evaluate a new investment that has the same risk as the firm$$s typical project?