Exxon Mobil Corporation had the following information for the year 2023:

4. 
   
   • Total Assets: $350 billion
   • Total Liabilities: $150 billion
   • Shareholders' Equity: $200 billion Calculate: a) The debt-to-equity ratio. b) The return on assets (ROA) if the net income for the year is $25 billion. c) The current ratio if the current assets are $120 billion and the current liabilities are $80 billion.