Acme Storage has a market capitalization of $$225$ million and debt outstanding of $$135$ million. Acme plans to maintain this same debt$-$equity ratio in the future. The firm pays an interest of $7\mathrm{.}6\%$ on its debt and has a corporate tax rate of $30\%.$

a$.$ If Acme's free cash flow is expected to be $$18\mathrm{.}00$ million next year and is expected to grow at a rate of $4\%$ per year, what is Acme's WACC?

b$.$ What is the value of Acme's interest tax shield?

a$.$ If Acme's free cash flow is expected to be $$18\mathrm{.}00$ million next year and is expected to grow at a rate of $4\%$ per year, what is Acme's WACC?

The WACC is

$\%.($Round to the nearest integer.$)$