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script.py

def ground_shipping(weight):

  if weight <= 2:
    ground_shipping = 1.50
  elif weight <= 6:
    ground_shipping = 3
  elif weight <= 10: 
    ground_shipping = 4
  else:
    ground_shipping = 4.75
    #all packages that weight over 10lbs will be charged  through the 'else' statement

  return 20 + (ground_shipping * weight)
  # need to multiply the price per pound (ground_shipping) with the weight of the package and add the flat charge to get the final cost of a given package

print(ground_shipping(8.4))
#always test your functions - in this case we are testing to see the cost of ground shipping for a 8.4lb package (should be $53.6)

premium_ground_shipping = 125
# a variable : flat charge for premium ground shipping 

def drone_shipping(weight):
  if weight <= 2:
    drone_shipping = 4.50
  elif weight <=6:
    drone_shipping = 9
  elif weight <=10:
    drone_shipping = 12
  else:
    drone_shipping = 14.25

  return weight * drone_shipping

print(drone_shipping(1.5))
#always test your functions - in this case we are testing to see the cost of drone shipping for a 1.5lb package (should be $6.75)


def cheapest_shipping_method(weight):
  ground = ground_shipping(weight)
  premium = premium_ground_shipping
  drone = drone_shipping(weight)

  if ground < premium and ground < drone:
    method = "standard ground"
    cost = ground
  elif drone < premium and drone <ground: 
    method = "drone"
    cost = drone
  else:
    method = "premium ground"
    cost = premium

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

cheapest_shipping_method(4.8)