The following data has been collected about a company's stockholders' equity accounts:

Common stock $10 par value 40,000 shares
authorized and 20,000 shares issued	$200,000
Paid-in capital in excess of par value, common stock	100,000
Retained earnings	50,000
Treasury stock, 4,000 shares	24,000

The treasury shares were all purchased at the same price. The cost per share of the treasury stock is:

$4.50

$8.50

$6.00

$12.00

$11.50