MNO Corporation's financials include:

• Total assets: $1,000,000
• Total liabilities: $400,000
• Common stock: $300,000
• Preferred stock: $50,000
• Retained earnings: $250,000
• Net income: $150,000
• Total revenues: $800,000

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