Apple Inc. 2023 Financials:

Financial Metric	Amount
Total Revenue	$400 billion
Cost of Goods Sold	$220 billion
Operating Expenses	$110 billion
Interest Expense	$5 billion
Tax Expense	$20 billion
Total Assets	$700 billion
Total Liabilities	$300 billion

1. Calculate the gross profit margin.
2. Determine the net profit margin.
3. Compute the interest coverage ratio.
4. Determine the return on equity (ROE).