7. Write a function named display_final_invoice() that applies a randomly generated discount to a lucky customer (decided by the get_lucky() function in 6.) and prints the updated final invoice as...

Extracted text: 7. Write a function named display_final_invoice() that applies a randomly generated discount to a lucky customer (decided by the get_lucky() function in 6.) and prints the updated final invoice as follows. Congratulations! Good news, you have been qualified for a 10% discount! Here is your final receipt! ==============================: ============ Spiked Umbrella x 3 Voice Changer x 3 Spy Camerа х 2 21.75 16.50 30.00 Subtotal (old): Subtotal (new): 68.25 61.42 Discount: 6.83 Тах: 7.99 Total: 69.41 ======== ============ 8. Write a main function that must call your other functions so that your program runs all required components of this Automatic Invoice Generator. Do not forget to add the main guard to ensure that the main() function does not get executed if your program is imported by some other program. A complete sample run of this program is available in section 3.