MNO Corporation's financials include:

• Total assets: $800,000
• Total liabilities: $350,000
• Common stock: $200,000
• Preferred stock: $40,000
• Retained earnings: $210,000
• Net income: $130,000
• Total revenues: $600,000

Determine: a) Debt-to-total-assets ratio b) Price-to-book ratio c) Return on common equity d) Earnings per share