In this work, you are going to implement a Java program that performs its payroll calculations. You are expected to use inheritance to perform payroll calculations based on the type of Employee ( consist of FullName and SSN, and double earnings()) public abstract class Employee I private String firstName; private String lastName; public abstract double earnings(); private String SSN; Figure 1: Employee - A company pays its employees on a weekly basis. - The company has four types of employees. - Salaried employees, who are paid a fixed weekly salary regardless of the number of hours worked, - Hour employees, who are paid by the hour (for example, wage * hours) and receive overtime pay (for example, (hours - 40) * wage * 1.5) and the maximum hours worked is 168 hours, - Commission employees, who are paid a percentage of their sales, - Salaried commission employees receive a base salary plus a percentage of their sales. The company has decided to reward salaried commission employees by adding 10 percentage to their salaries for the current pay period