Question

AllPaint is a shop that specialises in household paint products. They have approached you, an application developer for your services. They want you to develop an application that they will use in their shop to estimate the amount of paint that customers would need to purchase when they supply dimensions of their houses. Furthermore, they want you to integrate this system with their point of sale system, which would enable them to process paint sales. To process a sale, the system must calculate the amount of value added tax (VAT) and also calculate the amount of change after a customer tenders an amount. To develop this application, you will work on the following rules:

 A house is a three-dimensional structure (the dimensions are length, width and height)

 Two opposite walls are always equal

 A tin of paint covers about 10 square metres of wall space (doors and windows are not put into consideration).

6 HPX100-1-SA1-Jul-Dec2020-CZ-V2-27052020

Create an application using Java that prompts the user for the length, width and height of a rectangular room. Pass these THREE parameters to a method that does the following:

 calculate the wall area for the room and displays it inside a label when a button is clicked.

 passes the calculated wall area to another method that calculates and returns the number of tins of paint needed.

 displays the number of tins needed in a label. This must happen at the click of a button.

 compute the price of the paint given that a tin of paint costs R30 assuming that any fraction of paint is bought at the full price of a tin. The total cost of the paint should be displayed in a label when a button is clicked.

 The system (application) should calculate and display the amount of Value Added Tax (VAT) charged at a rate of 15% and the Total Cost of the paint after Value Added Tax should be displayed.

 Lastly the application should capture the amount tendered to the cashier and calculate and display the change.