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 O a. 10.09 b. 756% O 67.73% O d. 504 .4.249