Answer to Question #33412 in Trigonometry for em

Question

A surveyor stands at point A, which is due south of a tower OT of height h m. The angle of elevation of the top of the tower from A is 45 degrees. The surveyor then walks 100 m due east to point B, from where she measures the angle of elevation of the top of the tower to be 30 degrees.

P.S the answer says that the bearing is 130 degrees.

PLEASE PLEAS HELP ME I am really struggling to figure out how...