Just for fun... Can you answer the below stupid question....

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Hello friends... All are serious here.. I am different from that.. I like fun more than serious things... So i am putting this discussion just for a fun.. The below is a fun question.. Try to answer it.. Two persons A & B take a room on a lodge. The room rent is 20/-. The A & B passes this 20/- to the owner through a mediator C. The owner get discounted & return 5/- back to them through the same mediator C. The mediator C takes 2/- from that as a tip & return 3/- to A & B. So the each A & B's total expense is 8.5/- as the each got 1.5/- back..Then my question is,expense of A and B is 8.5x2=17/- and the mediator had taken a tip of 2/- therefore total expense is now 17+2=19. Then how did 1/- missed from the total 20/- which they given first... Now read the paragraph again.. The answer is simple.. I can give a clue.. I make you doubt only in the order or the way of question.. Don't read others answer... I am not sure that you have confused.. Because it want to ask through talk and not written.. Anyway way try it.. Now start... Challenge....