input: Write a function to convert a temperature given in Fahrenheit to Celsius. The function should return the temperature rounded to two decimal places.
  def fahrenheit_to_celsius(temp):
      celsius = (temp - 32) * 5/9 
      return round(celsius, 2)
  assert fahrenheit_to_celsius(32)==0.0
  assert fahrenheit_to_celsius(212)==100.0
  assert fahrenheit_to_celsius(-40)==-40.0
  assert fahrenheit_to_celsius(98.6)==37.0
  assert fahrenheit_to_celsius(68.0)==20.0
output: def fahrenheit_to_celsius(temp):
      celsius = (temp - 32) * 5/9 
      return round(celsius, 2)