ByFixed.php

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<?php
namespace Magento\SalesRule\Model\Rule\Action\Discount;

class ByFixed extends AbstractDiscount
{
    public function calculate($rule, $item, $qty)
    {
        $discountData = $this->discountFactory->create();

        $quoteAmount = $this->priceCurrency->convert($rule->getDiscountAmount(), $item->getQuote()->getStore());
        $discountData->setAmount($qty * $quoteAmount);
        $discountData->setBaseAmount($qty * $rule->getDiscountAmount());

        return $discountData;
    }

    public function fixQuantity($qty, $rule)
    {
        $step = $rule->getDiscountStep();
        if ($step) {
            $qty = floor($qty / $step) * $step;
        }

        return $qty;
    }
}