The following costs result from the production and sale of 4,950 drum sets manufactured by Tight Drums Company for the year ended December 31, 2015. The drum sets sell for $345 each. The company has a 40% income tax rate. $ 178,200 499,950 222,750 168,300 Variable production costs Plastic for casing Wages of assembly workers Drum stands Variable selling costs Sales commissions Fixed manufacturing costs Taxes on factory Factory maintenance Factory machinery depreciation Fixed selling and administrative costs Lease of equipment for sales staff Accounting staff salaries Administrative management salaries 5,500 11,000 71,000 11,000 61,000 141,000 Required: 1. Prepare a contribution margin income statement for the company. 2. Compute its contribution margin per unit and its contribution margin ratio. (Round Contribution margin ratio to nearest whole percentage.) TIGHT DRUMS COMPANY Contribution Margin Income Statement (partial) For Year Ended December 31, 2015 Per Unit Sales Variable costs: Total variable costs Contribution margin