The following costs result from the production and sale of 4,650 drum sets manufactured by Tight Drums Company for the year ended December 31. The drum sets sell for $315 each. Variable costs Plastic for casing Wages of assembly workers Drum stands Sales commissions Fixed costs 139,500 441,750 181,350. 130,200 Taxes on factory 8,500. Factory maintenance 17,000 Factory machinery depreciation 77,000 Lease of equipment for sales staff 17,000 Accounting staff salaries 67,000 Administrative salaries 147,000 Required: 1. Prepare a contribution margin income statement for the year. 2. Compute contribution margin per unit and contribution margin ratio. 3. For each dollar of sales, how much is left to cover fixed costs and contribute to income?