CREATE TABLE table_name_15 (erp_w VARCHAR, frequency_mhz VARCHAR)

Which ERP W has a Frequency MHz of 88.5 FM?
SELECT erp_w FROM table_name_15 WHERE frequency_mhz = "88.5 fm"
SELECT "erp_w" FROM "table_name_15" WHERE "88.5 fm" = "frequency_mhz"