The Monthly Sales Tax Problem. A retail company must file a monthly sales tax report listing the total sales for the month, and the amount of state and county sales tax collected. The state sales tax rate is 4 percent and the county sales tax rate is 2 percent. Create a GUI application that allows the user to enter the total sales for the month into a text field. From this figure, the application should calculate and display the following: The amount of county sales tax The amount of state sales tax The total sales tax (county plus state) In the applications code, represent the county tax rate (0.02) and the state tax rate (0.04) as named constants.