how much is it per day ?
　 how much is late check-out ?
　 how much is the room ?
　 how much is the extra charge ?
　같은 how much is 이지만, 각 문장에 it , X , the 가 붙는 이유는 왜 그런건가요?
 　how much is a room?
    how much is an extra charge?    문장도 있는데, 왜 the 가 붙는거죠?