The following data has been collected about Keller Company's stockholders' equity accounts:

Common stock $10 par value 20,000 shares authorized and 10,000 shares issued, 9,000 shares outstanding	$100,000
Paid-in capital in excess of par value, common stock	50,000
Retained earnings	25,000
Treasury stock	11,500

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

$1.15.

$1.28.

$11.50.

$10.50.

$10.00.