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[Johann]

Would it be right if I said that U.S. dentist charge 10 times more than Salvadorean dentist?

Yes- it would be about right, from your examples.

So I was figuring that 90 percent of 100 equals 10 correct?

No - that's (partly) where you went wrong. 90 percent of 100 equals 90 - not 10.

So you say it isn't correct to say that U.S. dentist charge 10 times more than Salvadorean dentist?

No - that IS substantially correct, going by your examples. What's wrong is to say a US dentist charges 90 percent more. US dentist (in your examples) appears to charge 900% more than - or 1,000% of the El Salvador price.

Your words were "dentist here that charges 90% more." As I just said, he charges MUCH more than 90% over the El Salvador price. "Dentist here that charges 9 or 10 times the price" might have been more appropriate.

I suppose Salvadorean dentist charges about 90 percent less than USA dentist.

Exactly right. Caution: when you turn it around, that does NOT mean the US dentist charges 90% MORE. That's where the error was.

BTW - Your math interpretation error doesn't mean anything. You're one VERY smart guy. After all -- you found good dental work, saved thousands --and had a good time too. Kudos to you!! You know your way around!

Johann