Perusing the corporate bond quotations, you write down some summary information:

Company (Ticker)	Coupon	Mat.	Last Price	Last Yield	Est Spread	Est UST	$Vol (000S)
Wal-Mart Stores
WMT	4.550	10 years	99.270	4.649	47	10	66,830
Wal-Mart Stores
WMT	4.125	8 years	99.554	4.200	2	10	50,320
Liberty Media
L	5.700	10 years	102.750	5.314	112	10	26,045
Ford Motor Credit
F	7.250	8 years	107.407	6.012	183	10	22,863

a. Which company is the riskiest? Why?

b. Which bond has the highest default risk? Why?

c. Why would Walmart have two bonds trading at different yields?

d. Compute the current yield for each of the four bonds.

e. Compute yield to maturity for each of the four bonds.