Problem $13\mathrm{.}24$ a$1-$a$5($Excel Video$)($a$4)$

Calculate the cost of common equity. $($Round intermediate calculations to $4$ decimal places, e$.$g$.1\mathrm{.}2514$ and final answer to $2$ decimal places, es$.15\mathrm{.}25\%.)$

Cost of common equity $\%$