To help finance a major expansion, Castro Chemical Company sold a noncallable bond several years ago that now has 20 years to maturity. This bond has a 6% annul coupon, paid semiannually, sells at a price of $1,200, and has a par value of $1,000. If the firm's tax rate is 40%, what is the component cost of debt for use in the WACC calculation? 8.15% 7.80% 2.685% 5.43% 6.67%