Amazon.com, Inc. has the following financial data for the fiscal year ending December 31, 2023:

• Total assets: $40,000,000
• Total liabilities: $24,000,000
• Total equity: $16,000,000
• Net income: $6,000,000
• Sales revenue: $32,000,000
• Cost of goods sold: $19,200,000
• Operating expenses: $4,800,000
• Interest expense: $800,000
• Income tax expense: $1,200,000

Calculate the following ratios for Amazon.com, Inc. for the fiscal year ending December 31, 2023:

1. Current ratio
2. Debt-to-equity ratio
3. Gross margin ratio
4. Net profit margin ratio