$12$ The balance sheet $($Table $7\mathrm{.}2)$ applies to the RST Company. Table $7\mathrm{.}2$ Balance sheet Assume the market value of the debt and stock are equal to the book values. The expected internal rates of return $($IRR$)$ of the different securities to the investors and also the costs to the firm are: Compute the weighted average cost of capital. Assume the corporate income tax rate is $0\mathrm{.}4.$