the following table summarizes yields to maturity on several 1 year zero coupon securities.

a. What is the price (expressed as a percentage of the face value) of a 1-year, zerocoupon corporate bond with a AAA-rating and a face value of $1,000 ? b. What is the credit spread on AAA-rated corporate bonds? c. What is the credit spread on B-rated corporate bonds? d. How does the credit spread change with the bond rating? Why? Note: Assume annual compounding