Show of Hands

JG91 March 20th, 2016 2:16pm

A room costs $30. 3 people share the room and pay $10 each. Then, it's discovered they were charged the wrong price, it's actually $25. So they give a $2 tip and take $1 each so they paid $9 each. 3 x $9 = $27 + $2 tip. Where's the last dollar gone?