Maryland Novelties Company produces and sells souvenir products. Monthly income statements for two activity levels are provided below: Unit volumes Revenue Less cost of goods sold Gross margin Less operating expenses Salaries and commissions Advertising expenses Administrative expenses Total operating expenses Net income Required 21,000 units $ 157,500 31,500 units $ 236,250 94,500 $ 141,750 63,000 $ 94,500 21,000 26,250 31,500 31,500 13,125 13,125 65,625 70,875 $ 28,875 $ 70,875 a. Identify each of the following expenses as fixed, variable, or mixed. b. Use the high-low method to separate the mixed costs into variable and fixed components. c. Prepare a contribution margin income statement at the 21,000-unit level. Complete this question by entering your answers in the tabs below. Required A Required B Required C