4 - A firm's overall cost of equity is: A. is the same as the firm's WACC given a leveraged firm. B. dependent on systematic risk of the firm C. dependent on the systematic risk of the firm, only if the firm has no debt. D. dependent upon yield to maturity and unsystematic risk E. dependent to changes in the firm's tax rate. 6 - The aftertax cost of debt generally increases when I. present value (price) decreases. II. the market rate of interest increases. III. coupon rates decreases. IV. yield to maturity decreases. A. I and II only B. III and IV only C. I, II, and III only D. II, III, and IV only E. I, II, III, and IV in market return