Use the following data from a firm's pro forma (i.e., projected or forecasted) financial statements to calculate the following profitability ratios for the firm, assuming that all stocks are common stocks: (a) net profit margin; (b) return on total assets; (c) return on equity; (d) price-earnings ratio. Sales $ 600 million Net income 30 million Total Assets 750 million Stockholders' Equity 500 million Number of Common Stock Shares 10 million Price per share of common stock $60.00