General Motors Company 2023 Financials:

Financial Metric	Amount
Total Revenue	$120 billion
Cost of Goods Sold	$80 billion
Operating Expenses	$25 billion
Interest Expense	$4 billion
Tax Expense	$6 billion
Total Assets	$200 billion
Total Liabilities	$90 billion

1. Calculate the operating profit margin.
2. Determine the net profit margin.
3. Compute the interest coverage ratio.

Determine the return on assets (ROA).