Twenty dollars.
In word forms, you can write it as 20 billion dollars, twenty billion dollars, $20 billion. Or you can write it as $20,000,000,000. There are at least 4 ways to write it, and probably more.
Seventy dollars.
$20,000,000
$20,000,000,000,000.00
Eighty thousand dollars
One hundred dollars
two hundred dollars
Thirty thousand dollars.
Seven hundred dollars.
Seventeen thousand dollars.
Eighty dollars.
Five hundred twenty dollars.