A corporate bond has a face value of $1,000 and a coupon rate of 5%. The bond matures in 15 years and has a current market price of $925. If the corporation sells more bonds it will incur flotation costs of $25 per bond. If the corporate tax rate is 35%, what is the after-tax cost of debt capital?

Select one:

a. 5.29%

b. 4.45%c. 3.92%d. 6.78%