Anno's+hat+tricks

There are two hats. One is red and one is white. Billie is wearing one of those hats. Hannah also is wearing one of those hats.Hannah's hat is red. What color is Billie's hat. This is easy logic. You can get hard anno's hat tricks in the book in the amth room. Please post harder Anno's hat tricks on this page.(answer on bottom of page)

P.S the answer is white.