Martha's Vineyard Marine Supply is a wholesaler for a large variety of boating and fishing equipment. The company's controller, Mathew Knight, has recently completed a cost study of the firm's material handling department in which he used work measurement to quantify the department's activity. The control factor unit used in the work-measurement study was pounds of equipment unloaded or loaded at the company's loading dock. Knight compiled the following data. Month January February March April May June July August September October November December Units of Activity (pounds of equipment loaded ON unloaded) 1,400 1,200 1,100 2,600 1,800 2,000 2,400 2,200 1,000 1,300 1,600 1,800 Material-Handling Department Costs $ 11,350 11,350 11,050 12,120 11,400 12,000 12,550 11,100 10,200 11,250 11,300 11,700 Required: Estimate the material-handling department's cost behavior using the high-low method. Use an equation to express the results of this estimation method. (Round coefficient of X to 2 decimal places.) 2. Calculate the estimated cost, assuming 2,900 pounds of equipment are loaded. 3. What type of cost is this called? (fixed, variable, or semi-variable)