Write a Java^TM GUI application using NetBeans^TM Integrated Development Environment (IDE) that calculates the total annual compensation of a salesperson.

Consider the following factors:

• The calculator should allow user to enter the amount of sales
• The calculator should allow user to select the level of commission rate from a list of pre-defined commission rate.  The three choices in the list are:
  • Entry member 3.5%
  • Journeyman member 6.75%
  • Senior member 11.25%
• The calculator should display the amount of commission in dollar, based on the amount of sales entered and the commission rate selected.
• The Java^TM application should meet these technical requirements:
  • The application should have at least one class, in addition to the application's controlling class (a controlling class is where the main function resides).
  • There should be proper documentation in the source code.