Six years ago XYZ International issued some 29-year zero-coupon bonds that were priced with a markets required yield to maturity of 14 percent and a par value of $1000. what did these bonds sell for when they were issues? Now that 6 years have passed and the markets required yield to maturity on these bonds has climbed to 16 percent, what are they selling for? if the markets required yield to maturity has fallen to 12 percent, what would they have been selling for?