input: from typing import List
  
  
  def determine_commission_rate(gross_sales: float) -> float:
      """
      Determines the commission rate based on the gross sales amount.
      The commission rates are as follows:
      - 10% for gross sales of 10000 or more
      - 7% for gross sales between 5000 and 10000
      - 5% for gross sales less than 5000
      >>> determine_commission_rate(12000)
      0.1
      >>> determine_commission_rate(7500)
      0.07
      >>> determine_commission_rate(2500)
      0.05
      """
output:     if gross_sales >= 10000:
          return 0.1
      elif gross_sales >= 5000:
          return 0.07
      else:
          return 0.05