Mac DeKnife owns a butcher shop. Looking at last year's utility bills, the highest utility bill was $6000 for 3000 machine hours. The lowest utility bill was $3750 for 1800 machine hours. 1 Calculate the variable rate per machine hour and the total fixed utility cost. 2 Show the equation for determining total utility costs. 3 If Mac plans on using 2400 machine hours, what will the total utility b: be using the equation in part 2