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I wrote in \classes\product\SpecificPriceFormatter.php:

        $this->specificPrice['save'] = $priceFormatter->format((($initialPrice * $this->specificPrice['quantity']) - ($discountPrice * $this->specificPrice['quantity'])));
        $this->specificPrice['unit_price'] = $priceFormatter->format($discountPrice);
        return $this->specificPrice;

But not work.