Ms. Pullara and Ms. Chng are both looking at the top of the school in the distance in the same line of sight, although Ms. Chng is 100 m ahead of Ms. Pullara. Ms. Pullara observes the school at an angle of 18 with the ground. If the top of the tower is 400 m from Ms. Chng, what is Ms. Chng's angle of sight with the ground? First make a sketch and then solve the problem to the nearest degree. /5