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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 an 8.25% annual coupon, paid semiannually, sells at a price of $825, 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. O a. 8.40% b. 7.75% O c 10.34% d. 5.17% e. 4.44%