Pound or pounds?

[MarkO]

Which sentence is correct -
1> You own me two POUNDS.
2> You own me two POUND.

Thanks...

[Rusty]

Which sentence is correct -
1> You own me two POUNDS.
2> You own me two POUND.

Thanks...
Here are ways to use money denominations.
You owe me two pounds.
You have a two pound debt.
You owe me two dollars.
You owe me two dollar. (Incorrect).
That'll be a two dollar charge.