input: from typing import List
  
  def determine_commission_rate(gross_sales: float) -> float:
      """ Given the gross sales amount, determine the commission rate based on the 
      following conditions:
      - If gross sales is 10000 or more, the commission rate is 0.1.
      - If gross sales is between 5000 and 10000, the commission rate is 0.07.
      - If gross sales is less than 5000, the commission rate is 0.05.
      >>> determine_commission_rate(12000)
      0.1
      >>> determine_commission_rate(7500)
      0.07
      >>> determine_commission_rate(3000)
      0.05
      """
output:     if gross_sales >= 10000:
          return 0.1
      elif gross_sales >= 5000:
          return 0.07
      else:
          return 0.05