public function calculate(Reportable $survey, Collection $categories, array $applicants): CategoriesDataObject 	{ 		$averagePerCategory = $this->totalAnswersPerCategory($categories, $applicants);  		$totalCategoriesAverage = $this->totalCategoriesAverage($averagePerCategory);  		$this->categoriesDataObject->setTotalCategoriesTurnedIntoScale4($totalCategoriesAverage);  		$this->categoriesDataObject->setAnswersPerCategory($this->totalAnswersPerCategory($categories, $applicants));  		$this->categoriesDataObject->setStars($totalCategoriesAverage);  		return $this->categoriesDataObject; 	}