Acme Storage has a market capitalization of $ $228$million$,$ and debt outstanding of $ $241$ million. Acme plans to maintain this same$$ debt$-$equity ratio in the future. The firm pays an interest of $8\mathrm{.}5\%$ on its debt and has a corporate tax rate of $21\%.$

a$.$ If$$ Acme's free cash flow is expected to be $ $32\mathrm{.}83$ million next year and is expected to grow at a rate of $5\%$ per$$ year, what is$$ Acme's WACC?

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

Please show work in excel.