ToPercent.php

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

class ToPercent extends ByPercent
{
    public function calculate($rule, $item, $qty)
    {
        $rulePercent = max(0, 100 - $rule->getDiscountAmount());
        $discountData = $this->_calculate($rule, $item, $qty, $rulePercent);

        return $discountData;
    }
}