Amazon.com, Inc. has shared the following information for its North America segment for the year ended December 31, 2023:

Income Statement

• Sales revenue: $300,000,000
• Cost of goods sold: $210,000,000
• Gross margin: $90,000,000
• Operating expenses:
  • Fulfillment expenses: $30,000,000
  • Technology and content expenses: $20,000,000
  • Marketing expenses: $10,000,000
• Operating income: $30,000,000
• Nonoperating items:
  • Interest expense: $5,000,000
  • Loss on disposal of assets: $2,000,000
• Net income: $23,000,000

Balance Sheet

• Assets:
  • Cash: $15,000,000
  • Accounts receivable: $10,000,000
  • Inventory: $25,000,000
  • Property and equipment: $50,000,000
• Total assets: $100,000,000
• Liabilities:
  • Accounts payable: $8,000,000
  • Short-term loans: $12,000,000
  • Long-term debt: $30,000,000
• Stockholders' equity: $50,000,000
• Total liabilities and stockholders' equity: $100,000,000

Requirements:

1. Calculate the gross profit margin.
2. Determine the operating profit margin.
3. Compute the return on assets (ROA).
4. Calculate the debt ratio.
5. Find the interest coverage ratio.