DiscountCalculator.php

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

use Magento\Catalog\Model\Product;

class DiscountCalculator
{
    public function calculateDiscount(Product $product, $value = null)
    {
        if ($value === null) {
            $value = $product->getPriceInfo()->getPrice(FinalPrice::PRICE_CODE)->getValue();
        }

        $discount = null;
        foreach ($product->getPriceInfo()->getPrices() as $price) {
            if ($price instanceof DiscountProviderInterface && $price->getDiscountPercent()) {
                $discount = min($price->getDiscountPercent(), $discount ?: $price->getDiscountPercent());
            }
        }
        return (null !== $discount) ?  $discount/100 * $value : $value;
    }
}