For the fiscal year ending December 31, 2023, Exxon Mobil Corporation reported the following financial figures: Total Revenue of $311,980 million, Operating Expenses of $271,450 million, and Net Income of $19,380 million. The company's total assets were $354,560 million, and total equity was $197,890 million.

Questions:

1. Calculate Exxon Mobil's operating profit margin.
2. Compute Exxon Mobil's net profit margin.
3. Calculate the return on assets (ROA) for Exxon Mobil.
4. Compute the return on equity (ROE) for Exxon Mobil.
5. If Exxon Mobil's total liabilities were $156,670 million, what is the debt to equity ratio?