This for question number 9 but in order to answer it you must first write the java program for question 8 as you will be using that program to answer question 9. That's why there are 2 questions.

8. CashRegister Class

Write a CashRegister class that can be used with the RetailItem class that you modified in Programming Challenge 7. The CashRegister class should simulate the sale of a retail item. It should have a constructor that accepts a RetailItem object as an argument. The constructor should also accept an integer that represents the quantity of items being purchased. In addition, the class should have the following methods:

The getSubtotal method should return the subtotal of the sale, which is the quantity multiplied by the retail cost. This method must get the retail cost from the RetailItem object that was passed as an argument to the constructor.

The getTax method should return the amount of sales tax on the purchase. The sales tax rate is 6% of a retail sale.

The getTotal method should return the total of the sale, which is the subtotal plus the sales tax.

Demonstrate the class in a program that asks the user for the quantity of items being purchased, and then displays the sales subtotal, amount of sales tax, and total.

9. Sales Receipt File

Modify the program you wrote in Programming Challenge 8 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 Price: $10.00 Quantity: 5 Subtotal: $50.00 Sales Tax: $ 3.00 Total: $53.00