The Rare Find Co$.$ has the following information:

Debt outstanding: $$1,500$ million

The before$-$tax cost of debt: $6\mathrm{.}5\%$

Market cap: $$4,400$ million

Cost of common stock: $12\%$

Tax rate: $21\%$

Rare Find is evaluating a project with the following information:

Over the next five years, EBIT will equal $153$ million each year

An investment of $$100$ million is required in net working capital at the beginning of the project, which will be recovered at the end.

The equipment cost will be $$175$ million, depreciated using the straight$-$line method to zero over the project's life, with no salvage value.

The project requires an additional $2\%$ risk premium above the firm's WACC.

a$.)$ Calculate the weight of debt for the firm. $($Calculate the after$-$tax cost of debt for the firm. $($Enter percentages as decimals and round to $4$ decimals$)$Enter percentages as decimals and round to $4$ decimals$)$

b$.)$ Calculate the after$-$tax cost of debt for the firm. $($Enter percentages as decimals and Calculate the WACC for the firm. $($Enter percentages as decimals and round to $4$ decimals$)$round to $4$ decimals$)$

c$.)$ Calculate the WACC for the firm. $($Enter percentages as decimals and round to $4$ decimals$)$

d$.)$ Calculate the risk$-$adjusted WACC for the firm. $($Enter percentages as decimals and round to $4$ decimals$)$