input: Write a python function to convert an amount in USD to CAD.
  assert convert_usd_to_cad(10) == 13.3
  assert convert_usd_to_cad(50) == 66.5
  assert convert_usd_to_cad(100) == 133.0
output: def convert_usd_to_cad(amount_usd):
      conversion_rate = 1.33
      return amount_usd * conversion_rate