United Parcel Service, Inc. (UPS) 2023 Financials:

Financial Metric	Amount
Total Revenue	$110 billion
Cost of Goods Sold	$70 billion
Operating Expenses	$25 billion
Interest Expense	$3 billion
Tax Expense	$5 billion
Total Assets	$150 billion
Total Liabilities	$70 billion

1. Calculate the operating profit margin.
2. Determine the net profit margin.
3. Compute the interest coverage ratio.
4. Determine the return on assets (ROA).