Hankins Corporation has 5.4 million shares of common stock outstanding, 290,000 shares of 5.6 percent preferred stock outstanding, and 125,000 of 6.7 percent semiannual bonds outstanding, par value $1,000 each. The common stock currently sells for $64 per share and has a beta of 1.13, the preferred stock currently sells for $103 per share, and the bonds have 20 years to maturity and sell for 109 percent of par. The market risk premium is 6.8 percent, T-bills are yielding 4.3 percent, and the firms tax rate is 34 percent.

What is the firms the pre-tax and after-tax cost of debt?

without using excel