Grandtotal.php

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<?php
namespace Magento\Tax\Block\Checkout;

class Grandtotal extends \Magento\Checkout\Block\Total\DefaultTotal
{
    protected $_template = 'Magento_Tax::checkout/grandtotal.phtml';

    protected $_taxConfig;

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\Customer\Model\Session $customerSession,
        \Magento\Checkout\Model\Session $checkoutSession,
        \Magento\Sales\Model\Config $salesConfig,
        \Magento\Tax\Model\Config $taxConfig,
        array $layoutProcessors = [],
        array $data = []
    ) {
        $this->_taxConfig = $taxConfig;
        parent::__construct($context, $customerSession, $checkoutSession, $salesConfig, $layoutProcessors, $data);
        $this->_isScopePrivate = true;
    }

    public function includeTax()
    {
        if ($this->getTotal()->getValue()) {
            return $this->_taxConfig->displayCartTaxWithGrandTotal($this->getStore());
        }
        return false;
    }

    public function getTotalExclTax()
    {
        $excl = $this->getTotal()->getValue() - $this->_totals['tax']->getValue();
        $excl = max($excl, 0);
        return $excl;
    }
}