apartments is ​-unit apartment complex. when the apartments are​ 90% occupied, monthly operating costs total . when occupancy dips to​ 80%, monthly operating costs fall to . the owner of the apartment complex is worried because many of the apartment residents work at a nearby manufacturing plant that has just announced it will close in three months. the apartment owner fears that occupancy of her apartments will drop to ​% if residents lose their jobs and move away. assuming the same relevant​ range, what can the owner expect her operating costs to be if occupancy falls to ​%