Some Mixed Cost and Activity level data : Month Activity Volume Maintenance (patient-days) Cost Incurred January 9,000 $6,900 February 7, 100 8,500 March 5,000 7,450 April 6,500 8,200 May 7,300 9,070 June 8,000 9,800 July 6,200 7,800 August 7,200 8,600 September |6,100 8,000 October 9,500 7,950 Using the High-Low method, compute: the variable cost per unit; the fixed cost; and then express the costs in equation form Y = a + bX