Know how to calculate a firm's MARR from its financing structure (debt versus equity), borrowing costs, owners' acceptable rate of return, and corporate income tax rate. For example, what is the firm's MARR if: (a) it is financed 25% by owners' equity and 75% by debt, (b) owners, require a 5% rate of return, (c) lenders charge 9% interest, and (d) its corporate tax rate is 35%?