Classes 3

public class Contract {
 private int totalCost;
 private int hoursLeft;
 private String employer;
 private static int hourlyRate;

 public Contract(String employer, int hours){
  this.employer = employer;
  this.hoursLeft = hours;
  this.totalCost = Contract.hourlyRate * hours;
 }
 //...

 public static void changeRate(int newRate){
  Contract.hourlyRate = newRate;
 }
}