CREATE TABLE table_31084 ("Rk" FLOAT, "Name" TEXT, "Country" TEXT, "Matches Played" FLOAT, "Matches Won" FLOAT, "Points" FLOAT, "Prize Money  ( USD ) " FLOAT)

What country offered a prize of 66400 US dollars?
SELECT "Country" FROM table_31084 WHERE "Prize Money (USD)" = '66400'
SELECT "Country" FROM "table_31084" WHERE "Prize Money (USD)" = '66400'