compute the cost of capital for the firm for the​ following: a. a bond that has a ​$ par value​ (face value) and a contract or coupon interest rate of percent. interest payments are ​$ and are paid semiannually. the bonds have a current market value of ​$ and will mature in years. the​ firm's marginal tax rate is percet. b. a new common stock issue that paid a ​$ dividend last year. the​ firm's dividends are expected to continue to grow at percent per​ year, forever. the price of the​ firm's common stock is now ​$. c. a preferred stock that sells for ​$​, pays a dividend of ​percent, and has a​ $100 par value. d. a bond selling to yield percent where the​ firm's tax rate is percent.