public function getCustomerItemQuantityOverageCost($code = null, $itemCode = null) {
		$item = $this->getCustomerItemQuantity($code, $itemCode);
		$overage = $this->getCustomerItemQuantityOverage($code, $itemCode);
		if ($overage) {
			return sprintf("%01.2f", $overage * $item['item']['overageAmount']);
		}
		return 0;
	}