UnitedHealth Group Incorporated 2023 Financial Overview:

Financial Metric	Amount
Total Revenue	$300 billion
Cost of Goods Sold	$200 billion
Operating Expenses	$70 billion
Interest Expense	$6 billion
Tax Expense	$10 billion
Total Assets	$400 billion
Total Liabilities	$180 billion

1. Calculate the gross profit margin.
2. Determine the operating profit margin.
3. Compute the times interest earned (TIE) ratio.
4. Calculate the return on assets (ROA).