Challenge exercise Suppose we wished a single TicketMachine object to be able to issue tickets of different prices. For instance, users might press a button on the physical machine to select a discounted ticket price. What further methods and/or fields would need to be added to TicketMachine to allow this kind of functionality? Do you think that many of the existing methods would need to be changed as well?
Save the better-ticket-machine project under a new name, and implement your changes in the new project.
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