Four years ago XYZ International issued some 33-year zero-coupon bonds that were priced with a market's required yield to maturity of 8 percent and a par value of $1,000. What did these bonds sell for when they were issued? Now that 4 years have passed and the market's required yield to maturity on these bonds has climbed to 10 percent, what are they selling for? If the market's required yield to maturity had fallen to 6 percent, what would they have been selling for?

Please show all work and if you know how to enter this in excel, please show that too!

a. What did these bonds sell for when they were issued? (Round to the nearest cent) b. Now that 4 years have passed and the market's required yield to maturity on these bonds has climbed to 10%, what are they selling for? S (Round to the nearest cent) c. If the market's required yield to maturity had fallen to 6 percent, what would they have been selling for? $(Round to the nearest cent)