3 men go into a hotel the man behind the desk said the room is 30.00?

I know how this question ends. Where is the other $1? Correct?

Well anytime anyone gives you this riddle just tell them that you can prove to them it's a simple riddle by answering three questions

1. How much was the hotel total?

Answer: $25

2. How much does each men have in their pocket after the refund?

Answer: $1 each X 3 men = $3 total

3. How much does the luggage boy have for a tip?

Answer: $2

Add them together there is no missing dollar.