As an accountant for General Motors, you are given the following financial data for the fiscal year ending December 31, 2023:

• Total assets: $50,000,000
• Total liabilities: $30,000,000
• Total equity: $20,000,000
• Net income: $5,000,000
• Sales revenue: $40,000,000
• Cost of goods sold: $24,000,000
• Operating expenses: $8,000,000
• Interest expense: $1,000,000
• Income tax expense: $2,000,000

Calculate the following ratios for General Motors 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