Five years ago ABC International issued some 30-yr zero coupon bonds that were priced with a markets required yield to maturity of 8%. What did these bonds sell for when they were issued?

Now that 5 years have passed and the markets required yield to maturity on these bonds has climbed to 10%, what are they selling for?

If the market's required yield to maturity had fallen to 6% what would they have been selling for?