Higher Computing AssignmentWatch
For finding the cost, it depends on what you wrote your assumptions as. I assumed that the cost per order would be the amount of tickets multiplied by the price for that night. In order to get the price per night, I sliced the ticket ID ([1:2]) to find out what day it was, which would then correlate to a number which was the price for that night.
edit: decided was unfair to post full solution. if you have questions just ask. I got full marks in the coral shield assignment Last year.