# Categorize the total amount of each transaction
def add_features(sample_cases):
  for txn in sample_cases:
    price = txn['totalAmt']
  if 0 <= price <= 1500:
    txn['totalAmtCat'] = 'Low'
  elif 1500 < price <= 3500:
    txn['totalAmtCat'] = 'Moderate'
  elif 3500 < price:
    txn['totalAmtCat'] = 'High'

return sample_cases