Apartments is 800​-unit apartment complex. When the apartments are​ 90% occupied, monthly operating costs total $220,040. When occupancy dips to​ 80%, monthly operating costs fall to $215,480. The owner of the apartment complex is worried because many of the apartment residents work at a nearby manufacturing plant that has just announced it will close in three months. The apartment owner fears that occupancy of her apartments will drop to 55​% if residents lose their jobs and move away. Assuming the same relevant​ range. Required:
a. What can the owner expect her operating costs to be if occupancy falls to 55​%?
b. Use the​ high-low method to determine operating cost equation
y=$
x + $ =