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, what can the owner expect her operating costs to be if occupancy falls to 55%?

Use the high-low method to determine operating cost equation

y=$_____

x + $ = ____