Walmart Inc. has the following financial data for the fiscal year ending January 31, 2024:

• Total assets: $15,000,000
• Total liabilities: $9,000,000
• Total equity: $6,000,000
• Net income: $2,000,000
• Sales revenue: $12,000,000
• Cost of goods sold: $7,200,000
• Operating expenses: $2,400,000
• Interest expense: $400,000
• Income tax expense: $600,000

Calculate the following ratios for Walmart Inc. for the fiscal year ending January 31, 2024:

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