At the present time, Turnbull Enterprises does not have any preferred stock outstanding but is looking to include preferred stock in its capital structure in the future. Turnbull has found some institutional investors that are willing to purchase its preferred stock issue provided that it pays a perpetual dividend of $$12$ per share. If the investors pay $$137\mathrm{.}66$ per share for their investment, then Turnbull$$s cost of preferred stock $($rounded to four decimal places$)$ will be $.$