PremiumService

public class PremiumService extends Customer {
    private double minVideoCall;
    private double minVideoMail;

    public PremiumService( String name, String address, String telNo, int noOfSms,
                           double minCall, boolean threeG, double minVideoCall, double minVideoMail ) {
        super( name,address, telNo, noOfSms, minCall, threeG );
        this.minVideoCall = minVideoCall;
        this.minVideoMail = minVideoMail;
    }

    public String toString() {
        return super.toString() + "\nVideo Call min: " + minVideoCall + "\nVideo Mail min: " + minVideoMail;
    }

    public double getTotalPremium() {
        double charge = minVideoCall + super.calCharge();
        return charge;
    }
}