A mystery..

Three women enter a hotel, and they each pay $10 to rent a hotel room with three beds, which costs $30. They give the money to the clerk at the front desk, and they take their luggage to room 613.
Later, the clerk realizes that he overcharged them. The room should have cost only $25. The clerk, being the nice guy that he is, gives the bell-boy five $1 bills to give back to the women. The bellboy brings the money to room 613. The women, being the nice women that they are, each take $1 and let the bellboy keep.the extra $2.
Each women originally paid $10, and they each accepted $1 from the bellboy. That means that each women actually paid $9. If three women paid $9 each, that means that together that paid $27 for the room. If the bellboy kept $2, that makes the total $29. But the women originally paid $30 total








What happened to th4 missing dollar?