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_name_56 (erp_w INTEGER, class VARCHAR, frequency_mhz VARCHAR)
  ### Question:
  Name the sum of ERP W for class of d and frequency mhz of 98.7
  ### Answer:
  SELECT SUM(erp_w) FROM table_name_56 WHERE class = "d" AND frequency_mhz = 98.7