Grandtotal.php

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<?php
namespace Magento\Tax\Model\Sales\Pdf;

class Grandtotal extends \Magento\Sales\Model\Order\Pdf\Total\DefaultTotal
{
    protected $_taxConfig;

    public function __construct(
        \Magento\Tax\Helper\Data $taxHelper,
        \Magento\Tax\Model\Calculation $taxCalculation,
        \Magento\Tax\Model\ResourceModel\Sales\Order\Tax\CollectionFactory $ordersFactory,
        \Magento\Tax\Model\Config $taxConfig,
        array $data = []
    ) {
        $this->_taxConfig = $taxConfig;
        parent::__construct($taxHelper, $taxCalculation, $ordersFactory, $data);
    }

    public function getTotalsForDisplay()
    {
        $store = $this->getOrder()->getStore();
        if (!$this->_taxConfig->displaySalesTaxWithGrandTotal($store)) {
            return parent::getTotalsForDisplay();
        }
        $amount = $this->getOrder()->formatPriceTxt($this->getAmount());
        $amountExclTax = $this->getAmount() - $this->getSource()->getTaxAmount();
        $amountExclTax = $amountExclTax > 0 ? $amountExclTax : 0;
        $amountExclTax = $this->getOrder()->formatPriceTxt($amountExclTax);
        $tax = $this->getOrder()->formatPriceTxt($this->getSource()->getTaxAmount());
        $fontSize = $this->getFontSize() ? $this->getFontSize() : 7;

        $totals = [
            [
                'amount' => $this->getAmountPrefix() . $amountExclTax,
                'label' => __('Grand Total (Excl. Tax)') . ':',
                'font_size' => $fontSize,
            ],
        ];

        if ($this->_taxConfig->displaySalesFullSummary($store)) {
            $totals = array_merge($totals, $this->getFullTaxInfo());
        }

        $totals[] = [
            'amount' => $this->getAmountPrefix() . $tax,
            'label' => __('Tax') . ':',
            'font_size' => $fontSize,
        ];
        $totals[] = [
            'amount' => $this->getAmountPrefix() . $amount,
            'label' => __('Grand Total (Incl. Tax)') . ':',
            'font_size' => $fontSize,
        ];
        return $totals;
    }
}