The Central Valley Company is a merehandising firm that sells a single product. The company's revenues and experses for the last three months are given below: Central Valley Company Comparative Income Statement For the Sccond Quarter 56 Required: a. Determine which expenses are mixed and, by use of the high-low method, separate each mixed expense into its variable and fixed components. State the cost formula for each mixed expense. b. Compute the company's total contribution margin for May