Problem 21-2A (Algo) Contribution margin income statement and contribution margin ratio LO A1 The following costs result from the production and sale of 4,100 drum sets manufactured by Tight Drums Company for the year ended December 31. The drum sets sell for $260 each. 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