Assume Annual, not Semi-annual

(Bond valuation) Seven years ago XYZ International issued some 32-year zero-coupon bonds that were priced with a market's required yield to maturity of 13 percent and a par value of $1,000. a. What did these bonds sell for when they wereissued? b. Now that 7 years have passed and the market's required yield to maturity on these bonds has climbed to 15percent, what are they selling for? c. If the market's required yield to maturity had fallen to 11 percent, what would they have been selling for?