/** * Apply adjustment amount and return result value * * @param float $amount * @param SaleableInterface $saleableItem * @return float */ public function applyAdjustment($amount, SaleableInterface $saleableItem) { $includingTax = !$this->taxHelper->priceIncludesTax(); return $this->taxHelper->getPriceUnrounded($saleableItem, $amount, $includingTax); }