How do you spell 30 dollars?

There are a few ways to spell 30 dollars, depending on the context:

* Thirty dollars (most common and formal)

* $30 (abbreviation for currency)

* Thirty bucks (informal slang)

* 30 USD (using the currency symbol and abbreviation)

* $30.00 (with decimal points for clarity)

Choose the spelling that best fits the situation.