Play linda Surf Shop provided the following information from its 2012 financial statements:

Total Assets	$655,000
Total Liabilities	225,000

In addition, the stockholders' equity section of the balance sheet showed:

Preferred stock, 10%, $2 par value, 10,000 authorized,
8,000 issued and outstanding, $5 liquidation value	$16,000
Common stock, $4 par value, 20,000 shares authorized,
10,000 issued and outstanding	40,000

The common stock had a year-end market price of $24.

A)	Calculate the book value per common share at year-end.

B)	Indicate the usefulness of this ratio for Play linda Surf Shop.