Mojo Mining has a bond outstanding that sells for $2,201 and matures in 21 years. The bond pays semiannual coupons and has a coupon rate of 7.38 percent. The par value is $2,000. If the company's tax rate is 24 percent, what is the aftertax cost of debt?

a. 6.66%

b. 5.36%

c. 6.22%

d. 4.67%

e. 5.06%