class Person {
    protected String personNr;

    public String hentPersonNr() {
        return personNr;
    }
}

interface Arbeidstaker {
    // protected int ansattNr;
    
    // Returnere ansattnummeret
    public int hentAnsattNr();
    //    return ansattNr;
    //}

    public double hentSkatteprosent();
    //    return 0.4;
    //}
}

abstract class Arbeidstaker {
    protected int ansattNr;

    public int hentAnsattNr() {
        return ansattNr;
    }

    public abstract double hentSkatteprosent();
}


class Student extends Person {
    protected int studentNr;

    public int hentStudentNr() {
        return studentNr;
    }
}


class ArbeidendeStudent extends Person implements Arbeidstaker {
    protected int ansattNr;

    @Override
    public int hentAnsattNr() {
        return ansattNr;
    }

    @Override
    public double hentSkatteprosent() {
        return 0.1;
    }

}