Half Truth Airlines has $9$ million shares outstanding, each priced

at $$23.$ Half Truth's cost of equity is $11\mathrm{.}79\%,$ the cost of debt is $2\mathrm{.}9\%,$

and the tax rate is $50\%.$ Find the firm's WACC if the balance sheet is

as follows.

a$.7\mathrm{.}55\%$

b$.7\mathrm{.}60\%$

c$.7\mathrm{.}75\%$

d$.7\mathrm{.}70\%$

e$.7\mathrm{.}65\%$