(Bond valuation) Four years ago XYZ International issued some 29 -year zero-coupon bonds that were priced with a market's required yield to maturity of 99 percent and a par value of $1,000. What did these bonds sell for when they were issued? Now that 44 years have passed and the market's required yield to maturity on these bonds has climbed to 11 percent, what are they selling for? If the market's required yield to maturity had fallen to 77 percent, what would they have been selling for?