how do you solve this?

10. Your company also has 20-year, semi-annual bonds outstanding with a 5 percent coupon. The face amount of each bond is $1,000. These bonds are currently selling for 114 percent of face value. What is the company's pre-tax cost of debt? And your firm's subsidiary has bonds outstanding that mature in 13 years, have a 6 percent coupon, and pay interest annually. These bonds have a face value of $1,000 and a current market price of $1,040. What is the company's after-tax cost of debt if its tax rate is 32 percent