Sales Receipt File

Modify the program you wrote in Programming Challenge 6 to create a file containing a sales receipt. The program should ask the user for the quantity of items being purchased, and then generate a file with contents similar to the following:

SALES RECEIPT
Unit Pricei $10.00
Quantity: 5
Subtotal: $50.00
Sales Tax: $ 3.00
Total: $53.00
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