code: private function ati(float $amount): float
      {
          $result = $amount;
  
          foreach ($this->taxes as $tax) {
              $result += $amount * $tax->getRate() / 100;
          }
  
          return Money::round($result, $this->currency);
      }
docs: Adds the taxes to the given amount.
  
  @param float $amount
  
  @return float