c# programming question

Question

can anyone give solution to this problem ?

 

Create an interface called Payable. The Payable interface should contain three functions:

Retrieve amount due

Add to amount due

Payment address

Derive an Employee class from the Person class. The Employee class should add the following properties:

Salary

Mailing address

In addition, the Employee class should implement the Payable interface. The implementation of the functions specified in the Payable interface should make sense. In other words, the payment address should be the mailing address of the employee. In order to make this work right, you will need to allocate an internally protected state variable that keeps track of the amount of money due. This state variable will obviously be modified by the functions defined in the interface