Sales Receipt FileModify the program you wrote in Programming Challenge 6 to create a file...

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:

Programming Challenge 6

CashRegister Class

Write a CashRegister class that can be used with the Retailltem class that you wrote in Chapter 6’s Programming Challenge 4. The CashRegister class should simulate the sale of a retail item. It should have a constructor that accepts a Retailltem 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 price. This method must get the price from the Retailltem 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 percent 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 sale’s subtotal, amount of sales tax, and total.

Programming Challenge 4

Retailltem Class

Write a class named Retailltem that holds data about an item in a retail store. The class should have the following fields:

• description. The description field references a String object that holds a brief description of the item.

• unitsOnHand. The unitsOnHand field is an int variable that holds the number of units currently in inventory.

• price. The price field is a double that holds the item’s retail price.

Write a constructor that accepts arguments for each field, appropriate mutator methods that store values in these fields, and accessor methods that return the values in these fields. Once you have written the class, write a separate program that creates three Retailltem objects and stores the following data in them: