Excel company was established to be growing at a rate of $2\mathrm{.}0\%$ with its common stock trading at a share price of $$75$ against the original issuance value of $$45.$ Management has opted for a fixed amount of dividend distribution annually at $$3\mathrm{.}75$ per share and is not inclined to change this for at least the significant foreseeable future. Financial research firms has determined its beta coefficient to be $1\mathrm{.}2$ while long$-$term treasury yield stands at $3\mathrm{.}5\%.$ What is the most likely cost of common stock $($ks$)$ for the company? Answer in decimal placed value and not in percentage.