Net Profit Margin
Net Profit Margin ratio tells us how much profit is generated from our sales, specifically the percentage of sales revenue that ends up in profit. Net profit margin is the most important indicator of a company's overall financial health.
This ratio also indicates the amount of revenue you are losing through costs and expenses associated with your business.
Generally, a net profit margin 5% is a low margin, 10% is a healthy margin, and 20% is a high margin, though it depends on the industry and the structure of the business.

Where To Find Data
Net Income- Income Statement or as known as (Profit or loss statement)
Revenue - Income Statement or as known as (Profit or loss statement)