@@ -0,0 +1,394 @@
+public abstract class TaxableItem implements Item %7B%0A    private double taxRate;%0A%0A    public abstract double getListPrice();%0A%0A    public TaxableItem(double rate) %7B%0A        taxRate = rate;%0A    %7D%0A%0A    /*************  Part (a) *************/%0A    // returns the price of the item including the tax%0A    public double purchasePrice() %7B%0A        return this.getListPrice() * (1 + this.taxRate);%0A    %7D%0A%7D%0A

Create TaxableItem.java