Let's Forget About The Money And Do Some Maths !

Hi MMG members !
let us relax and forget the money ! let us make our brains work a while not for finding the best income or preventing such scammer
I 'll give you a math problem and hope that no one knows it !


In the birthdat of Jim ,3 of his friends decided to buy him a prize
And while they were seraching , they found a nice football so they asked the seller for the price and it was for 15$ but the seller wasn't the shop owner .
Ok ! so Tom paid 5$ and Peter did the same then Bob too
they brought the ball and go away ....

Then the shop owner came and asked the seller for what he sold today : and the seller said that he sold the football for 15$ . So the owner replied that the ball coasts just 10$ and you have to give this 5$ back to them !
The seller was not a trusted man so he puttted 2$ in his pocket and gave the 3 remaining to the 3 boys
Let's sum up now !
Tom paid 5$ and got back 1 so totally he paid 4$
The same thing for Peter he paid totally 4$ and Bob too 4$
So when the three boys paid 4$ each we got 3*4=12$ and when we add them the 2$ stolen by the seller we get 12+2=14$.

So friends can you tell me where the 1$ has gone ? ??????????


Think about it ! and tell me your solutions
And if you didn't get it I may sell you the solution
Good luck !