SpecialPrice.php

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<?php
namespace Magento\Bundle\Pricing\Price;

use Magento\Catalog\Pricing\Price\RegularPrice;

class SpecialPrice extends \Magento\Catalog\Pricing\Price\SpecialPrice implements DiscountProviderInterface
{
    protected $percent;

    public function getDiscountPercent()
    {
        if ($this->percent === null) {
            $this->percent = parent::getValue();
        }
        return $this->percent;
    }

    public function getValue()
    {
        if ($this->value !== null) {
            return $this->value;
        }

        $specialPrice = $this->getDiscountPercent();
        if ($specialPrice) {
            $regularPrice = $this->getRegularPrice();
            $this->value = $regularPrice * ($specialPrice / 100);
        } else {
            $this->value = false;
        }
        return $this->value;
    }

    protected function getRegularPrice()
    {
        return $this->priceInfo->getPrice(RegularPrice::PRICE_CODE)->getValue();
    }

    public function isPercentageDiscount()
    {
        return true;
    }
}