A person stands at a window on the 9thfloor of an office building. He measures the angle of elevation to be 25oand the angle of depression to be 36oof the top and the base of a tower. The person knows that he made the measurements 40 m above the ground. Determine the height of the tower to the nearest tenth of a metre

"curse these trig-loving pirates! " devora mutters as she looks at the map. then, after thinking for a moment, she walks back to the entrance of the secret cave, measuring 48 meters along the way. after performing a calculation, devora walks back to the empty treasure, faces the entrance, and turns a certain number of degrees to her left before walking 89 meters to the treasure. supposing that the angle at the cave entrance is acute and that devora's calculations were correct, how many degrees did she turn?