Lets play mathematical game be winner by solving the problems.

Hey friends , let us play a mathematical game. I will give a question , the one who can give correct answer with reason will be the winner .let me start the question:
Three friends went to tea shop . Each friends have $15( they all total have$45). They order a cup of tea for the shopkeeper. The cost of a cup of a tea is $15. They gave$45 to the sshopkeeper. The shopkeeper was good person , so he discounted and gave them $5 cash back. They distribute$1 to each of them and now they have $2 left. The three friends decided to gave that$2 to the waiter.
Now let's calculate all total money.
1)They each paid $14 for a cup of tea.
Now $14×3=$42
2)They gave to waiter=$2
3) In their pocket they have =$3( they distribute to each other)
Now let's add all
$(42+3+2)=$47
Whats amazing how the $45 became$47 .The $2 is being more. What is the actual total money? How does this happen?
Anyone have any idea please write on comment.