Where is the one buck???

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solve the problem please??? here is the situation: there are three persons who had ate in a restuarant. after eating they could the waiter to get there bill. the waiter said that they had the bill of 30 bucks.. so each one of them contributed 10 bucks for the food.. afterwards the waiter had return to say that they only had to pay 25 bucks for it..(5 bucks remain) they divided the remaining bucks into three one buck was returned to them each.. and decided to give the remaining 2 bucks for the tip..so if your going to analize..each of them gave 10 bucks and have in return one buck... therefore: each of them contributed 9 bucks each and for the tip is 2 bucks..if your going to sum it up..you will have 29 bucks.. the question is:: Where is the one buck???