Big Door Company has $8\mathrm{.}7$ million shares outstanding, which are currently trading for about $$13$ per share and have a levered equity beta of $1\mathrm{.}2.$ Big Door has $19,900$ outstanding bonds, with a $4\%$ coupon rate, payable semi$-$annually and due in $10$ years. The bonds are rated BBB$.$ Currently the credit spread for BBB is $178$ basis points over equivalent$-$maturity Government of Canada debt. The current yield on $10-$year Canada bonds is $5\%,$ compounded semi$-$annually. The risk$-$free interest rate is $2\%,$ and the market risk premium is $6\mathrm{.}6\%.$ The company has a $35\%$ tax rate. $($Do not round intermediate calculations.$)$

a$.$ Calculate Big Door's WAC$($C$.($Round your answer to $2$ decimal places.$)$

WACC

b$.$ Calculate Big Door's unlevered beta, using the following formula: $($Round your answer to $2$ decimal places.$)$

${}_U=\frac{{}_{\text{e}\text{v}\text{e}\text{r}\text{e}\text{d}}+{}_{\text{d}\text{e}\text{c}\text{t}}(1-T_c)\text{D}\text{I}\text{E}}{1+(1-T_c)\frac{D}{E}}$

Unlevered beta

c$.$ If Big Door was $50\%$ debt$-$financed, what would be its WACC? Assume that the beta of its debt is unchanged by the capital structure change. $($Round your answer to $2$ decimal places.$)$

WACC $$