Q3. (25 marks) A manufacturing manager collected the following information for the Production Department: Observation Machine-hours January 8,000 Total Operating costs 60,000 66,000 61,000 February 9,200 March 7,600 April 8.800 54,000 65,000 May 9,000 June 6,100 61,000 July 9,300 68,000 Required: b. Determine the estimating cost function with machine-hours as the cost driver using the high-low method. Express your results in the form of a linear equation y = a + bx Required: b. Determine the estimating cost function with machine-hours as the cost driver using the high-low method. Express your results in the form of a linear equation y = a + bx. b. If August's estimated machine hours total 9,600, what is the estimated cost of the Production Department