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)	$96.17	$91.82	$87.19	$82.33	$77.32

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?