The following table summarizes prices of various default-free zero-coupon bonds (expressed as a percentage of the face value): 1 3 4 Maturity (years) Price (per $100 face value) 2 $90.78 5 $76.16 $95.23 $86.10 $81.29 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