Pfizer Inc. Financial Data for 2023:

• Total Revenue: $100 billion
• Cost of Goods Sold: $50 billion
• Operating Expenses: $35 billion
• Interest Expense: $4 billion
• Tax Expense: $8 billion
• Total Assets: $180 billion
• Total Liabilities: $90 billion

1. Calculate the gross profit margin.
2. Determine the net profit margin.
3. Compute the times interest earned (TIE) ratio.
4. Calculate the equity multiplier.