1) Goofy Gas Works has bonds that mature in 10 years

The bonds have a 10% coupon rate paid quarterly.

They have a before tax cost of debt of 8% and a tax bracket of 35%

What is the cost of debt? Answer should be 5.2%, need work to justify all answers.

2) Wild Child Motors has a 12 year bond that carries an 8% semi-annual coupon rate and a nominal yield to maturity of 6%. The firm incurs flotation costs of 3% of the price of the bond. What is the cost of the debt if the firm is in the 40% tax bracket? answer should be 3.83%

3) Jolly Jelly bean Co. has a bond with a 12 year maturity date and a 9% Semi-annual coupon rate.The bond had a Nominal yield to maturity of 7%. The firm would pay $3 flotation cost. What is the bonds cost of debt if the firm is in the 35% tax bracket? answer should be 4.58%

Please help with all 3 problems!!!!