The following data are from the accounting records of Niles Castings for year 2: 86,000 Units produced and sold Total revenues and costs Sales revenue Direct materials costs Direct labor costs Variable manufacturing overhead Fixed manufacturing overhead Variable marketing and administrative costs Fixed marketing and administrative costs $ 320,000 64,000 34,000 11,000 48,000 17,000 31,000 Required: a. Prepare a gross margin income statement. Gross Margin Income Statement b. Prepare a contribution margin income statement Contribution Margin Income Statement MacBoo