sub price{
    my $self = shift;

    # price is base price - quantity discount + shipping
    return $self->{_quantity} * $self->{_item_price}
        - max( 0, $self->{_quantity} - 500)
          * $self->{_item_price} * 0.05
        + min( $self->{_quantity} 
               * $self->{_item_price} * 0.1, 100.0);
}

##</code><code>##

sub price{
    my $self = shift;

    my $base_price = $self->{_quantity} * $self->{_item_price};
    my $quantity_discount = max( 0, $self->{_quantity} - 500)
                            * $self->{_item_price} * 0.05;
    my $shipping = min( $self->{_quantity}
                        * $self->{_item_price} * 0.1, 100.0);

    return $base_price - $quantity_discount + $shipping;
}

##</code><code>##

perl -e 'split//,q{john hurl, pest caretaker}and(map{print @_[$_]}(join(q{},map{sprintf(qq{%010u},$_)}(2**2*307*4993,5*101*641*5261,7*59*79*36997,13*17*71*45131,3**2*67*89*167*181))=~/\d{2}/g));'