Company ABC is a multinational corporation that manufactures and sells consumer electronics. Below is the comparative financial data for the last three years.

Description	2021	2020	2019
Sales	$1,500,000	$1,200,000	$1,000,000
Cost of Goods Sold	$900,000	$720,000	$600,000
Gross Profit	$600,000	$480,000	$400,000
Selling Expenses	$150,000	$120,000	$100,000
Administrative Expenses	$100,000	$80,000	$60,000
Total Expenses	$250,000	$200,000	$160,000
Income Before Taxes	$350,000	$280,000	$240,000
Income Tax Expense	$70,000	$56,000	$48,000
Net Income	$280,000	$224,000	$192,000

Requirements:

1. Calculate the Gross Profit Margin for each year.
2. Determine the Operating Profit Margin for each year.
3. Compute the Net Profit Margin for each year.
4. Analyze the trend in profitability over the three years.