If you ran this site the computer will be your shopkeeper and you will be the customer
It will start by saying "Hello,what is your name" and you enter your name and it will say hello and then the name that was been writen
The computer(Shopkeeer) will show you the list of items and asks you how many items do you want to buy and then show the total of that item.
Then the shopkeeper will ask you how many times you want and if you type 2 then it will give the total of the two items.
The shopkeeper then will add and give you the bill.Then you write the amount you want pay.
And it will give you the correct Change