Below are the comparative income statements for Alphabet Inc. (Google) for the years ended December 31, 2022, and 2021.

Alphabet Inc.	2022	2021
Sales	$282,836	$257,637
Cost of Goods Sold	$125,983	$106,899
Gross Profit	$156,853	$150,738
Operating Expenses	$69,511	$63,027
Net Income	$76,033	$67,407

Requirements:

1. Calculate the gross profit margin for each year.
2. Calculate the operating profit margin for each year.
3. Compute the net profit margin for each year.
4. Discuss Alphabet Inc.'s profitability trends over these two years.