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 17,450 April 6,500 8,200 17,300 9,070 June 8,000 9,800 July 6,200 17,800 August 17,200 8,600 September 6,100 8,000 October 9,500 7,950 May 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