// discount for members

public class Member extends Product {

	protected final double DISCOUNT = 0.8; 
	
	protected boolean isMember;
	
	public Member(String name, double price, boolean isMember){
		super(name, price);	// refer to parameter values
		this.isMember = isMember; 
	}
	
	public double cost(){
		double total = price;
		if (isMember == true)
			total = total * DISCOUNT; 	// 20% discount
		return total;
	}
	
}