Footballer+Salary

Footballer Salary Calculator
Write a program which will accept as input:
 * A footballer's salary
 * His win bonus
 * His agent fees

The program should then calculate the final salary by adding the bonus to the basic salary, and then subtracting the agent fees.

You should:


 * 1) Draw an Input-Process-Output diagram
 * 2) Draw a screen design, with labelled fields and buttons
 * 3) Produce a pseudocode design
 * 4) Write the program

Extension:

Amend the program so that the agent fee is calculated as half of the win bonus