Question 4: High-Low Method Time: 15 minutes Total: 10 marks A manufacturing manager collected the following information for the Production Department: Machine-hours 8,000 9,200 Observation January February March April May Total Operating costs $60,000 66,000 61,000 64,000 65,000 7,600 8,800 9,000 Required: a. Determine the estimating cost function with machine-hours as the cost driver using the high-low method. b. If June's estimated machine-hours total 8,400, what is the estimated cost of the Production Department