An aircraft with an empty weight of 1500 lb and an empty weight CG of +28.4 was altered as follows: 2 12 lb seats located at +68.5 were removed, structural modifications weighing +28 lb were made at +73, a seat and safety belt weighing 30 lb were installed at +70.5, and radio equipment weighing 25 lb was installed at +85. What is the new empty weight CG?