Eighty months. That's six years, eight months and that's just the principal.
Forty thousand dollars can be written in words as "forty thousand dollars." If you are using it in a formal context, such as a check, you might also write it as "Forty Thousand and 00/100 dollars."
three hundred forty thousand dollars
$40,000
You can write one million two hundred and forty thousand dollars as $1,240,000.00
9000 dollars
$416
$47,646. (BTW, if you say and, that usually means decimal. Say it like this: Forty-seven thousand, six hundred forty six dollars. )
Forty Thousand Dollars
$42,000.00
$40,000.00
$13,333.33
1200