a. To determine the earnings per share on common stock, we need to subtract the preferred dividends from the net income and then divide by the number of shares of common stock outstanding:
Net income - Preferred dividends = $318,000 - $18,000 = $300,000
Earnings per share = $300,000 / 40,000 = $7.50 per share
Therefore, the company's earnings per share on common stock is $7.50.
b. The price-earnings ratio is calculated by dividing the market price per share of common stock by the earnings per share:
Price-earnings ratio = Market price per share / Earnings per share
Price-earnings ratio = $33.00 / $7.50
Price-earnings ratio = 4.4
Therefore, the company's price-earnings ratio is 4.4.