Zero. Please search this site for the word DOUBLE. You'll find hundreds of similar questions about these trick "coins".
They cost about $8 in novelty shops.
It is worth nothing. You could try and take the two headed coin to a coin expert. But it is just a misprint.
Depending on condition a 1841 quarter can be worth 25 to 1000 dollars. it has to be in uncirculated condition for it to be worth 1000 dollars.
2000,000,000,000 dollars
it might be worth 6 dollars to 10 dollars
12 dollars
2-3 dollars
it is worth about 50 dollars
i think it is worth 2,000 dollars
This will be worth a minimum of 800 dollars or more. This is a rare coin and is really only worth what a dealer will pay for it or a private person on auction sites.
1-7 dollars
Only 3 are know to exist. Its worth about 10 million dollars