when i booked room from hotel

the total is 200$

I paid 50% (100$)

the balance is 100$ ( it's correct say that balance )

broken heart
Hi, BH.

Yes, it's correct. You paid $100 in advance when you booked the room. You will owe the balance of $100 if you actually take the room. Your 50% deposit may be forfited if you don't complete the deal.

The balance may be due when you register (check in) or when you check out.

Best wishes, - A.
Balance is the correct term.