Presented below is the production data for six months showing the mixed costs incurred by a company. Month Cost Units July $5,890 4,100 August 4,024 3,250 September 7,480 6,300 October 8,640 November 5,800 5,800 December 7,336 6,600 a) Using the high-low method, determine the cost function. b) If in January they expect to produce 7,100 units, what will the cost be? 7,500