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

• Total assets: $90,000,000
• Total liabilities: $54,000,000
• Total equity: $36,000,000
• Net income: $12,000,000
• Sales revenue: $72,000,000
• Cost of goods sold: $43,200,000
• Operating expenses: $14,400,000
• Interest expense: $2,400,000
• Income tax expense: $3,600,000

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