In main, add a loop to enable the user to run the Python program all day without having to restart the program. Make a question to the user control this loop (this question should NOT ask how many times they want to repeat, since they dont know this). When you add the loop, also add a counter and an accumulator so that at the end of the day, when the user no longer wants to continue or process another order, you can output the number of orders processed that day and how much money those orders were worth (sum of the grand totals, which includes a possible discount on the pre-tax total and tax owed). All of this code can go into main, which should still fit on one screen.

In addition, write an error checking loop that will only exit when the user has entered a value for cash tendered that is more than the total amount owed.