Tracey Packaged Snax reports the following information for November: Units produced and sold Per unit revenue and costs: Sales revenue Direct materials costs Direct labor costs Variable manufacturing overhead Fixed manufacturing overhead (at 320,000 units) Variable marketing and administrative costs Fixed marketing and administrative costs (at 320,000 units) Required: a. Prepare a gross margin income statement. b. Prepare a contribution margin income statement. 320,000 $ 10.60 1.75 1.00 0.90 1.65 0.85 1.25