Given the following financial data for Apple Inc. for the years 2019, 2020, and 2021, perform the required analysis:

	2019	2020	2021
Sales	$260,174	$274,515	$365,817
Cost of Sales	$161,782	$169,559	$212,981
Gross Profit	$98,392	$104,956	$152,836
Operating Expenses	$34,187	$36,096	$43,880
Operating Income	$64,205	$68,860	$108,956
Net Income	$55,256	$57,411	$94,680

	2019	2020	2021
Total Assets	$338,516	$323,888	$351,002
Total Liabilities	$248,028	$245,064	$287,912
Shareholders' Equity	$90,488	$78,824	$63,090

Requirements:

1. Calculate the gross profit margin for each year.
2. Determine the operating profit margin for each year.
3. Calculate the net profit margin for each year.
4. Compute the return on assets (ROA) for each year.
5. Compute the return on equity (ROE) for each year.
6. Evaluate the trend in Apple's financial performance over these three years.