Face value...although many would say that is actually much less than when it was made.
At the time, it was worth one dollar.
I have a 5 dollar 1981 bill signed by the treasurer. Is this worth anything?
It's still worth $5.
Is worth anything
15 to 20 dollars
$50.00
It's worth a dollar. You can go to the bank and ask them to trade a dollar bill for a Sacajawea dollar. Presto!
50 Mexican dollars.
that would generally sell in the $100 to $200 range
a half hundred dollar bill is worth $50
It's worth 5 dollars.
Dollar bills are not always worth one dollar, however one dollar bills are worth one dollar for the sake that 1=1, it is a one dollar bill, and can be exchanged for goods and services.