Here are book$-$ and market$-$value balance sheets of the United Frypan Company $($figures in $ millions$)$:

$\backslash$table$[[$Book$-$Value,Balance,Sheet,$],[$Net working capital,$ $80,$Debt,$ $55],[$Long$-$term assets,$20,$Equity,$45],[$$ $100,,$$ $100]]$

$\backslash$table$[[$Market$-$Value Balance Sheet$],[$Net working capital,$ $80,$Debt,$ $55],[$Long$-$term assets,$145,$Equity,$170],[,$$ $225,,$$ $225]]$

Assume that MM$\text{'}$s theory holds except for taxes. There is no growth, and the $$55$ of debt is expected to be permanent. Assume a $21\%$ corporate tax rate.

a$.$ How much of the firm's value is accounted for by the debt$-$generated tax shield?

Note: Enter your answer in million rounded to $2$ decimal places.

b$.$ What is United Frypan's after$-$tax WACC if $r_{\text{D}\text{e}\text{b}\text{t}}=6\mathrm{.}0\%$ and $r_{\text{E}\text{q}\text{u}\text{i}\text{t}\text{y}}=17\mathrm{.}0\%?$

Note: Do not round intermediate calculations. Enter your answer as a percent rounded to $2$ decimal places.

c$.$ Now suppose that Congress passes a law that eliminates the deductibility of interest for tax purposes after a grace period of $5$ years. What will be the new value of the firm, other things equal? Assume an $6\mathrm{.}0\%$ borrowing rate.

Note: Do not round intermediate calculations. Enter your answer in million rounded to $2$ decimal flaces.

$\backslash$table$[[$a$.$ PV tax shield,,million$],[$b$.$ WACC,,$\%$