To help finance a major expansion, Castro Chemical Company sold a noncallable bond several years ago that now has 15 years to maturity. This bond has a 8.25% annual coupon, paid semiannually, sells at a price of $1,095, 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? a. 4.25% b. 4.32% c. 4.45% d. 4.68% e. 5.03%