1. Add one abstract method to Employee.
public double caculateSalary(int workDays, double hourPay);
2. For each of derived class Nurse and Staff, add following attribute:
int workDays,
double hourPay;
3. Implement you own caculateSalary(int days, double hourPay) in both derived class, make your own designed formula to calculate salary and print out.
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