Frequently, people incorrectly specify monetary values.
INCORRECT: $25 dollars
In this case, the dollar sign already indicates that you are talking about dollars. You don't need the word, too.
CORRECT: 25 dollars
CORRECT: twenty-five dollars
Values under a dollar can also be stated incorrectly.
INCORRECT: .25 cents
In the case above, you're actually talking about a quarter of a penny, not a quarter of a dollar! Use one of these formats instead:
CORRECT: 25 cents
CORRECT: twenty-five cents