Java:

1. Retail Price Calculator :

Create a GUI calculator where the user enters a wholesale cost of an item and its markup percentage into textfields. When a button is pressed, display the item's retail price. For example if the item's wholesale cost is $5 and its markup percentage is 100 percent then its retail price is $10.00

2. Display the retail price with a$ and 2 digits after the decimal

3. Display "Invalid data" and change the color of the textfield when invalid data is entered in the textfields.