THE CASE OF THE MISSING DOLLAR

THREE MEN CHECKED INTO A HOTEL AND THE CLERK TOLD THEM IT WOULD BE 30 DOLLARS, PAYABLE IN ADVANCE. EACH MAN GAVE THE CLERK 10 DOLLARS AND WENT TO THEIR ROOM. REALIZING HE HAD OVERCHARGED TO MEN BY 5 DOLLARS, HE GIVES THE BELL HOP FIVE DOLLARS AND TELLS HIM TO GIVE IT TO THE MEN.  REALIZING THE OPPORTUNITY TO MAKE SOME MONEY, THE HOP KEEPS TWO DOLLARS FOR HIMSELF AND GIVES THE MEN BACK THREE DOLLARS.  THIS MEANS THE MEN SPENT 27 DOLLARS FOR THE ROOM.  THE BELL HOP HAS TWO DOLLARS.  27 AND 2 MAKES 29 DOLLARS.  THE MEN PAID 30 AT THE DESK.  WHAT HAPPENED TO THE ONE DOLLAR MISSING?