Bramble Gravity Grips produces spike sets for track shoes. CEO Brittany Bramble has gathered the following information about the company's sales volume and marketing cost for the past six months: January February March April May June Sales Volume 65,600 49,600 71,100 75,600 68,600 77,800 Total Marketing Costs $8,158 $6,634 $8.560 $8,655 $8,310 $8,890 (a) Identify the high and low points. Machine Hours $ High point $ Low point $ (a) Identify the high and low points. Machine Hours $ High point $ Low point $ 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 $ per spike set sold