Grand.php

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<?php
namespace Magento\Quote\Model\Quote\Address\Total;

class Grand extends \Magento\Quote\Model\Quote\Address\Total\AbstractTotal
{
    public function collect(
        \Magento\Quote\Model\Quote $quote,
        \Magento\Quote\Api\Data\ShippingAssignmentInterface $shippingAssignment,
        \Magento\Quote\Model\Quote\Address\Total $total
    ) {
        $grandTotal = $total->getGrandTotal();
        $baseGrandTotal = $total->getBaseGrandTotal();
        $totals = array_sum($total->getAllTotalAmounts());
        $baseTotals = array_sum($total->getAllBaseTotalAmounts());

        $total->setGrandTotal($grandTotal + $totals);
        $total->setBaseGrandTotal($baseGrandTotal + $baseTotals);
        return $this;
    }

    public function fetch(\Magento\Quote\Model\Quote $quote, \Magento\Quote\Model\Quote\Address\Total $total)
    {
        return [
            'code' => $this->getCode(),
            'title' => __('Grand Total'),
            'value' => $total->getGrandTotal(),
            'area' => 'footer',
        ];
    }
}