Javits & Sons$$ common stock currently trades at $$30\mathrm{.}00$ a share. It is expected to pay an annual dividend of $$3\mathrm{.}00$ a share at the

end of the year, and the constant growth rate is $5\%$ a year.

What is the company$$s cost of common equity if all of its equity comes from retained earnings? $($Use DCF method$)$