You are analyzing the gross profit margins of two companies, Company X and Company Y, for the fiscal year 2023.

Company	Net Sales Revenue (in millions)	Cost of Goods Sold (COGS) (in millions)	Gross Profit (in millions)
Company X	$400	$200	$200
Company Y	$600	$300	$300

Requirements:

1. Calculate the gross profit margin for both Company X and Company Y.
2. Compare the profitability of Company X and Company Y based on their gross profit margins.
3. Discuss potential factors influencing the differences in gross profit margins between Company X and Company Y.