Review the following comparative income statements for Walmart Inc. for the years ended January 31, 2023, and 2022.

Walmart Inc.	2023	2022
Sales	$611,289	$572,754
Cost of Goods Sold	$456,237	$428,413
Gross Profit	$155,052	$144,341
Operating Expenses	$101,209	$95,987
Net Income	$30,862	$25,825

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. Provide an analysis of Walmart Inc.'s profitability trends over these two years.