3 A small caf sells coffee for 3 50 per cup On average it costs the caf 0 50 to make a cup of coffee for grounds hot water filters The caf also has fixed costs of 450 for rent wages utilities a Find a formula for C x the cost of making x cups of coffee Remember this includes fixed daily costs as well as the cost for all x cups of coffee I b Find a formula for R x the revenue brought in by selling x cups of coffee c Find a formula for P x the profit made by making and selling x cups of coffee In general Profit Revenue Cost d For what values of x is Profit negative