The following table summarizes prices of various default-free zero-coupon bonds (expressed as a percentage of the face value): Maturity (years) 1 2 3 4 5 Price (per $100 face value) $95.77 $91.36 $86.81 ?$82.05 $76.84 a. Compute the yield to maturity for each bond. b. Plot the zero-coupon yield curve? (for the first five years). c. Is the yield curve upward sloping, downward sloping, or flat?