private function priceIncludingVat(Article $article) : Money { if ($article->type() instanceof ArticleTypeNormal) { $taxFactor = 1 + $this->country->vat() / 100; } else { $taxFactor = 1 + $this->country->reducedVat() / 100; } $price = (int) ($article->price()->amount() * $taxFactor); return new Euro($price); }