Tri Co$.$ has the following cost of debt structure: The market risk premium is $4\mathrm{.}5\%,$ the risk free rate is

$3\mathrm{.}5\%,$ beta of unleveraged firm is $1\mathrm{.}10,$ Hamada's equation $b=b_U[1+(1-T)(\frac{w_d}{w_e})].T=25\%.$

Please use the above information to answer following questions:

a$.$ If the firm uses $60\%$ debt, what is the cost of equity of the firm, based on CAPM model?

b$.$ What is WACC of the firm?

c$.$ If $FC{F}_0=300$ million, $g=4\%,$ what is the firm value?