public class DiscountBill extends GroceryBill $\{$

private boolean preferredCustomer;

private int discountCount;

private double totalDiscountAmount;

$//$ Constructor for DiscountBill

public DiscountBill$($Employee clerk, boolean preferred$)\{$

super$($clerk$)$;

preferredCustomer $=$ preferred;

discountCount $=0$;

totalDiscountAmount $=0\mathrm{.}0$;

$\}$

$//$ Overrides add method to compute discounts for preferred customers

@Override

public void add$($Item i$)\{$

super.add$($i$)$;

if $($preferredCustomer && i$.$getDiscount$()>0\mathrm{.}0)\{$

discountCount$++$;

totalDiscountAmount $+=$ i$.$getDiscount$()$;

$\}$

$\}$

$//$ Overrides getTotal method to apply discounts for preferred customers

@Override

public double getTotal$()\{$

double total $=$ super.getTotal$()$;

if $($preferredCustomer$)\{$

total $-=$ totalDiscountAmount;

$\}$

return total;

$\}$

$//$ Returns the number of items that were discounted, if any

public int getDiscountCount$()\{$

return discountCount;

$\}$

$//$ Returns the total discount for this list of items, if any

public double getDiscountAmount$()\{$

return totalDiscountAmount;

$\}$

$//$ Returns the percent of the total discount as a percent of what the total would have been otherwise

public double getDiscountPercent$()\{$

if $($preferredCustomer$)\{$

double originalTotal $=$ super.getTotal$()+$ totalDiscountAmount;

return $($totalDiscountAmount $/$ originalTotal$)*100\mathrm{.}0$;

$\}$ else $\{$

return $0\mathrm{.}0$;

$\}$

$\}$

$\}$