6.) Texas Airlines issued a bond that pays $80 in interest, with a $1,000 par value. It matures in 20 years. The market's required yield to maturity on a comparable-risk bond is 7%. a) Calculate the value of the bond. (2 points) b) How does the value change if the markets required yield to maturity on a comparable- risk bond decreases to 6%? (2 points) c) Assume that the bond matures in 10 years instead of 20 years. What is the value of the bond in this case? (2 points) d) Explain your answer in question c) as it relates to interest-rate risk, using the terms discount bond and premium bond in your answer. (3 points)