text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_24620684_2 (operating_mode VARCHAR, epa_rated_combined_fuel_economy VARCHAR)
  ### Question:
  When  87 mpg-e (39kw-hrs/100mi) is the  epa rated combined fuel economy how many operating modes are there?
  ### Answer:
  SELECT COUNT(operating_mode) FROM table_24620684_2 WHERE epa_rated_combined_fuel_economy = "87 mpg-e (39kW-hrs/100mi)"