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script.py

def Ground_sh_cost(weight):
  if weight<=2:
    cost = 20 + weight*1.5
  elif weight<=6:
    cost = 20 + weight*3
  elif weight<=10:
    cost = 20 + weight*4
  elif 10<weight:
    cost = 20 + weight*4.75
  return cost

Premium_cost = 125.0
    
def Drone_sh_cost(weight):
  if weight<=2:
    cost = weight*4.5
  elif weight<=6:
    cost = weight*9.0
  elif weight<=10:
    cost = weight*12.0
  elif weight>10:
    cost = weight*14.25
  return cost

def Cheapest_cost(weight):
  Ground_cost = Ground_sh_cost(weight)
  Drone_cost = Drone_sh_cost(weight)
  
  if Ground_cost<=Drone_cost and Drone_cost<=Premium_cost:
    method = "ground shipping"
    cost = Ground_cost
  elif Drone_cost<=Ground_cost and Ground_cost<=Premium_cost:
    method = "drone shipping"
    cost = Drone_cost
  elif Premium_cost<=Drone_cost and Drone_cost<=Ground_cost:
    method = "premium shipping"
    cost = Premium_cost

  print(
    "The cheapest shipping cost is $%.2f using  %s."
    % (cost, method)
  )

Cheapest_cost(5)
Cheapest_cost(12)