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 9.50% annual coupon, paid semiannually, sells at a price of $950, and has a par value of $1,000. If the firm's tax rate is 25%, what is the component cost of debt for use in the WACC calculation? Do not round your intermediate calculations. a. 4.24% b. 7.73% c. 7.56% d. 5,04% e. 10.0996