I included the answers to the questions. I just need help understanding how to get to the answers so please show your work. Thank you!

16. What is the firms cost of debt? ---> ANS: 12%

17. What is the required return on common stock and on preferred stock? ---> ANS: 12.17%, 5.63%

18. What portion of the firm is financed with debt? ---> ANS: 42%

19. What is the weighted average cost of capital for this firm? ---> ANS: 10.06%

Use the following information to answer questions 16-19 Balance Sheet (All values are based on current market values) Current Assets Fixed Assets $2,000,000 $3,000,000 Debt Preferred Stock Common Stocks2,650,427 Total Liabilities and Owner's Equity $5,000,000 $2,099,573 $250,000 Total Assets $5,000,000 The firm's debt consists of 15% coupon bonds that pay coupons semiannually and mature in 20 years. There are 1713 bonds outstanding. There are 6250 shares of preferred stock outstanding selling in the market for $40 each. The preferred stock pays an annual dividend of $2.25. The current market price of the firm's common stock is $25.75. The firm just paid out annual dividends of $1.50 to common stockholders. It is expected that dividends will grow by 6% each year, forever. The firm's marginal tax rate is 34%