dave is an owner and manager of three apartment buildings in northern minnesota. during an exceptionally hot summer the temperatures soared and the toll on the window air conditioners was too much. seventeen of them have broken down already, and more are probably going to have to be replaced. he has a total of seventy-five apartment units. dave is now in the process of deciding how to repair the air conditioning. should he buy new window units for all the buildings, or should he install central air conditioning? what type of decision is dave facing?