CREATE TABLE table_127511_1 (ion_torrent_pgm VARCHAR, sanger_3730xl VARCHAR)

How many times was Sanger 3730xl $2400 usd?
SELECT COUNT(ion_torrent_pgm) FROM table_127511_1 WHERE sanger_3730xl = "$2400 USD"
SELECT COUNT("ion_torrent_pgm") FROM "table_127511_1" WHERE "$2400 USD" = "sanger_3730xl"