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As an example, if it costs you $100 to make a product and you can sell it for $1000, you pocket $900 of the $1000 and therefore make 90% margin.
You could have made your point more effectively if you'd said something like "your math is correct, but it's important to keep in mind that the actual tariffs eliminate the entire current profit margin for almost every product in the category we are talking about."
Instead you began with a personal attack. It's hard for a discussion to recover from that.