A smooth, vertical wall is 25 feet high and retains a cohesionless soil with a unit weight of 115 pcf and an angle of internal friction of 30 degrees. The top of the soil is level with the top of the wall, and the soil carries a uniformly distributed load of 500 psf. Calculate the total active earth force of the wall per linear foot and determine its point of application from the base of wall by Rankine theory.