Rollins Corporation is constructing its MCC schedule. Its target capital structure is 20 percent debt, 20 percent preferred stock, and 60 percent common equity. Its bonds have a 12 percent coupon, paid semiannually, a current maturity of 20 years, and sell for $1,000. The firm's marginal tax rate is 40 percent. Which of the following is Rollins' component cost of debt?

5.3%

6.8%

7.2%

8.4%