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_29289372_1 (area__km²_ VARCHAR, income_classification VARCHAR, population__2010_ VARCHAR)
  ### Question:
  When 318676 is the population of 2010 and 1st class is the income classification what is the area in kilometers squared?
  ### Answer:
  SELECT area__km²_ FROM table_29289372_1 WHERE income_classification = "1st Class" AND population__2010_ = 318676