Answer:
(a) Earnings per share = Net income ÷ Number of shares 
 = $22,500,000 ÷ 6,500,000 
 = $3.46 
 Price-earnings ratio = Stock price ÷ Earnings per share 
 = $72 ÷ $3.46 
 = 20.81 
 (b) Earnings per share = Net income ÷ Number of shares 
 = $22,500,000 ÷ (6,500,000 + 650,000) 
 = $3.15 
 
R = (M0 - S) ÷ (N + 1) 
 = ($72 - $66.50) ÷ (7 + 1) 
 = $0.69 
where,
M0 = current market price of Walker common stock
S = selling price per share
N = seven rights is needed to buy one of the new shares
 Ex-rights price = Rights-on price - Rights value 
 = $72 - $0.69 
 = $71.31 
 Price-earnings ratio = Stock price ÷ Earnings per share 
 = $71.31 ÷ $3.15 
 = 22.64