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script.py

def ground_shipping(weight):
  if weight > 10.0:
    return weight * 4.75 + 20.0
  elif weight > 6.0 and weight <= 10.0:
    return weight * 4.00 + 20.0
  elif weight > 2.0 and weight <= 6.0:
    return weight * 3.00 + 20.0
  else:
	  return weight * 1.50 + 20.0

print(ground_shipping(8.4))

premium_ground_shipping = 125.0

def drone_shipping(weight):
  if weight > 10.0:
    return weight * 14.25 + 0.0
  elif weight > 6.0 and weight <= 10.0:
    return weight * 12.00 + 0.0
  elif weight > 2.0 and weight <= 6.0:
    return weight * 9.00 + 0.0
  else:
	  return weight * 4.50 + 0.0
    
print(drone_shipping(1.5))

def find_lowest(weight):
  shipping_method = ''
  ground_cost = ground_shipping(weight) 
  drone_cost = drone_shipping(weight)
  if ground_cost < drone_cost and ground_cost < premium_ground_shipping:
    shipping_method = 'ground'
    return shipping_method, ground_cost
  elif drone_cost < ground_cost and drone_cost < premium_ground_shipping:
    shipping_method = 'drone'
    return shipping_method, drone_cost
  else:
    shipping_method = 'premium ground'
    return shipping_method, premium_ground_shipping

lowest_cost = 0.0
lowest_shipping_method = ''

lowest_shipping_method, lowest_cost = find_lowest(4.8)
print('The lowest method is: ' + lowest_shipping_method + ' at a cost of $' + str(lowest_cost) + '.') 

lowest_shipping_method, lowest_cost = find_lowest(41.5)
print('The lowest method is: ' + lowest_shipping_method + ' at a cost of $' + str(lowest_cost) + '.')