public function taxTotal($formatted = true)
    {
        $taxTotal = 0.00;
        $cartProducts = $this->getSession();
        foreach ($cartProducts as $product) {
            $taxTotal += $product->tax();
        }

        if ($formatted == true) {
            $symbol = Session::get('currency_symbol');
            return  $symbol . number_format($taxTotal, 2);
        }

        return $taxTotal;
    }