A retaining wall with a vertical back 5 m high supports cohesion less backfill of unit weight of 19 kN/m3. The upper surface of the backfill rises at an angle of 10° with the horizontal from the crest of the wall. The angle of internal friction for the soil is 30°, and the angle of wall friction is 20°. Verify the total active pressure per lineal metre of the wall and mark the direction and point of application of the thrust. Use Ruthann's graphical method.