ent Attempt in Progress Waterway Gravity Grips produces spike sets for track shoes. CEO Brittany Waterway has gathered the following information about the company's sales volume and marketing cost for the past six months: Sales Volume Total Marketing Costs January 64,600 $8,108 February 48,600 $6,584 March 70,100 $8,460 April 74,600 $8,605 May 67,600 $8,210 June 76,800 $8,840 (a) Identify the high and low points. High point Low point Machine Hours +A $ -/40 EE Using the high-low method, compute the variable marketing cost per spike set. (Round unit cost to 2 decimal places, e.g. 52.75.) Variable marketing cost eTextbook and Media Save for Later $ per spike set sold