DEF Ltd. provides the following financial data:

• Total assets: $1,300,000
• Total liabilities: $400,000
• Common stock: $300,000
• Retained earnings: $250,000
• Net income: $200,000
• Total revenues: $900,000
• Total expenses: $700,000

Determine: a) Debt ratio b) Earnings per share c) Return on investment d) Asset turnover ratio