protected function totalDiscounts(): void 	{ 		$discounts = '0';  		foreach ($this->discounts as $discount) { 			$discounts = MathMoneyOperations::calculate($discounts, MathMoneyOperations::calculate((string) $this->quantity, $discount->getAmount(), '*'), '+'); 		}  		$this->totals->setTotalDiscounts($discounts); 	}