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"Dollar" is used only with an unit
Give her one dollar.

More than one unit is ever "Dollars"
I'd gamble a hundred thousand dollars.
10 dollars is correct, Silversamand!
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... depends on the context, I would think...

It is my understanding that you would say "gimme 10 dollars" or "I owe him 10 dollars" or "this item costs 10 dollars"... but that you have to say "a 10 dollar banknote" or "a 10 dollar amount is what he got out of it" or "I'm browsing for a 10 dollar item".

... but I would be unable to explain this in grammar terms, so I'm not sure I've done a good job at convincing you guys...
As an adjective, the singular is used. a ten-dollar bill, a twelve-foot plank, a 20-function calculator.*
As a noun, the plural is used (unless you are talking about only one thing, of course). ten dollars, twelve feet, 20 functions, one dollar, one foot, one function.


*These are also found without the hyphens: ten dollar bill, etc.
Makes full sense... Thxs Jim for explaining it in grammar terms !
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10 Dollars is the correct answer
When I go to the Doctor's office, the receptionist always states, "You have a ten dollars co-pay". I can't tell you how badly I want to correct her. The poster before is correct, in adjective form it is singular, while in noun form it is plural.

"You have a ten dollars co-pay"

I've never heard the term 'co-pay' before. I assume it is short for 'co-payment'.

Does this mean 'You have to pay a ten dollar deductible'? eg You pay the first $10, and the insurer pays the rest? Or does it mean that you each pay $10?

Best wishes, Clive
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