(a) Find the required return for new bondholders and the after-tax cost of debt.

(b) Find the required return for new preferred stockholders and the after-tax cost of preferred.

(c) Find the required return for new common stockholders, the after-tax cost of internal common equity, and the after-tax cost of external common equity.

(d) Find the break point for the WACC.

(e) Calculate the WACCs