CREATE TABLE table_55788 ("Ordinary income rate" TEXT, "Long-term capital gain rate" TEXT, "Short-term capital gain rate" TEXT, "Long-term gain on commercial buildings*" TEXT, "Long-term gain on collectibles" TEXT)

What is short-term capital gain rate with long-term gain on collectibles at 15%?
SELECT "Short-term capital gain rate" FROM table_55788 WHERE "Long-term gain on collectibles" = '15%'
SELECT "Short-term capital gain rate" FROM "table_55788" WHERE "Long-term gain on collectibles" = '15%'