help with these three asap please and show work, thanks in advance

8. Suppose your firm just issued a 20-year, $1000 par value bond with semiannual coupons. The coupon interest rate is 6%. The bonds sold for par value, but flotation costs amounted to 5% of the price. You have a 21% corporate tax rate, what is your firm's cost of debt? a)5.5% c)6.448% e)74% b) 6.00% d) 5.09% 9.Varephase Corporation has preferred stock outstanding. The stock has a 13% dividend rate. The stock's market price is $80 per share, and its par value is $75. If new shares are issued, the firm will pay $2 per share in flotation costs. The corporate tax rate is 21%, what is the company's cost of preferred stock financing? a) 11.54% c)9.12% e) 12.00% b)12.5% d) 9.74% 10. Bioplex Corporation has a capital structure of 20% debt, 10% preferred stock, and 70% equity The firm's cost of equity is 12%, cost of preferred is 996, and the pre-tax cost of debt is 6%. If the corporate tax rate is 21%, what is the firm's cost of capital? a)9.55% c)9.80% e)8.67% b) 10.25% d) 9.97%