For the year 2023, General Electric Company reported the following: total revenue of $90 billion, cost of goods sold of $50 billion, operating expenses of $25 billion, interest expense of $4 billion, and tax expense of $5 billion. The company’s total assets amounted to $180 billion, and its total liabilities were $80 billion.

1. Calculate the gross profit margin.
2. Determine the net profit margin.
3. Compute the interest coverage ratio.
4. Determine the debt-to-equity ratio.