The application should calculate and display the order amounts and the grand total in Label control. The clear button must clear
all text boxes and calculated labels. The exit button must close the window.
Input validation: Make sure the number of units for each package is numeric, and is not negative.
Use the following test data to determine if the application is calculating properly.
Units sold:
Package A: 15 Units
Package B: 75 Units
Package C: 120 Units
Amount of Order
Package A: $1188.00
Package B: $8955.00
Package C: $17,940.00
Grand total: $28,083.00