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I am a dropshipper and average margin on products I sell is 60-100%.At the risk of being nitpicky, it sounds like you may be talking about your markup, not your margin.
Markup = ( SalePrice - YourCost ) / YourCost
Margin = ( SalePrice - YourCost ) / SalePrice
Each is typically expressed as a percentage, and we're talking about the
gross margin here, not the net (net margin takes into account other business expenses).
If your gross margin is 100%, it means you got the product for free:
Margin
= ( SalePrice - 0 ) / SalePrice
= SalePrice / SalePrice
= 1
= 100%
And your markup is infinite:
Markup
= ( SalePrice - 0 ) / 0
= SalePrice / 0
= Infinity or beyond [1]
More typical examples: buy a product for $50 and sell it for $100, your markup is 100%, and your gross margin is 50%.
Or buy for $25 and sell for $100: Markup is 300% and gross margin is 75%.
[1] https://en.wikipedia.org/wiki/Division_by_zero
But what if your SalePrice is also 0? I asked our Lenovo Smart Display about this: "Hey Google, what's zero divided by zero."
She replied "No one knows. It's possible that zero divided by zero is some unknown number mathematicians have yet to discover. Maybe they'll name it after you!"