The tax rate is $50\%.$ Firm A has a Debt$-$to$-$Equity ratio $($D$/$E$)$ of $200\%.$

Figure out the debt$-$to$-$firm value $($D$/$V$)$ using the Debt$-$to$-$Equity ratio $($D$/$E$).(20$points$)$

Figure out the weighted average cost of capital of Firm A $($WACC$).(20$points$)$