Please make sure the answer is correct and explain how you got it, thanks!

Willams Software has 77 percent coupon bonds on the market with 24 years to maturity. The bonds make semiannual payments and currently sell for 108.5 percent of par. a. What is the current yield on the bonds? Note: Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16. b. What is the YTM? Note: Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.9., 32.16. c. What is the effective annual yield? Note: Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g. 32.16