the typical cost of responding to a fire emergency for the local fire department depends on the type of dwelling. for family homes, the cost ascends to 800 usd, whereas for apartments and other types of dwellings the costs are 500 usd and 1,000 usd. the monthly budget for the fire department emergency response team is 20,000 usd. what is, in expectance, the maximum number of fires to which the fire department will be able to provide assistance without running out of budget?