Martha's Vineyard Marine Supply is a wholesaler for a lorge 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 hundreds of pounds of equipment unloaded or loaded at the company's loading dock. Knight compiled the following data. Required: 5. 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.)