text: # create the initial variables below
  age = 28
  sex = 0 # 0 for female, 1 for male
  bmi = 26.2 # body mass index
  num_of_children = 3
  smoker = 0 # 0 for a non-smoker, 1 for a smoker
  
  # Add insurance estimate formula below
  insurance_cost = 250 * age - 128 * sex + 370 * bmi + 425 * num_of_children + 24000 * smoker - 12500
  
  print("This person's insurance cost is", insurance_cost, "dollars.")
  # Age Factor
  age += 4
  
  new_insurance_cost = 250 * age - 128 * sex + 370 * bmi + 425 * num_of_children + 24000 * smoker - 12500
  
  change_in_insurance_cost = new_insurance_cost - insurance_cost
  
  print("The change in cost of insurance after increasing the age by 4 years is", change_in_insurance_cost, "dollars.")
  # BMI Factor
  age = 28 # original value
  bmi += 3.1
  
  new_insurance_cost = 250 * age - 128 * sex + 370 * bmi + 425 * num_of_children + 24000 * smoker - 12500
  
  change_in_insurance_cost = new_insurance_cost - insurance_cost
  
  print("The change in estimated insurance cost after increasing BMI by 3.1 is",change_in_insurance_cost,"dollars.")
  
  # Male vs. Female Factor
  bmi = 26.2 # original value
  sex = 1 # male
  
  new_insurance_cost = 250 * age - 128 * sex + 370 * bmi + 425 * num_of_children + 24000 * smoker - 12500
  
  change_in_insurance_cost = new_insurance_cost - insurance_cost
  
  print("The change in estimated cost for being male instead of female is", change_in_insurance_cost,"dollars.")
  
  # num_of_children factor
  sex = 0 # original value
  num_of_children += 2
  
  new_insurance_cost = 250 * age - 128 * sex + 370 * bmi + 425 * num_of_children + 24000 * smoker - 12500
  
  change_in_insurance_cost = new_insurance_cost - insurance_cost
  
  print("The change in estimated of insurance cost after increasing number of children by 2", change_in_insurance_cost,"dollars.")
  
  # smoker factor
  num_of_children = 3 # original value
  smoker = 1 # smoker
  
  new_insurance_cost = 250 * age - 128 * sex + 370 * bmi + 425 * num_of_children + 24000 * smoker - 12500
  
  change_in_insurance_cost = new_insurance_cost - insurance_cost
  
  print("The change in estimated cost for being smoker instead of non-smoker is", change_in_insurance_cost,"dollars.")
  
  