The following table summarizes prices of various default-free zero-coupon bonds (expressed as a percentage of the face value):

price per $100 face value

1- $96.76

2-$92.32

3-$87.67

4-$82.79

5-$77.75

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?