Company B sells its product for $40 per box. Each box contains 50 units. The company produced and sold 3,000 boxes this month. Variable Costs per Box Manufacturing Direct Materials $ 15.00 Direct Labor 3.00 Fixed Costs per Month Manufacturing Overhead Selling and Administrative Total $ 15,000 10,000 $ 25,000 Manufacturing Overhead 10.00 $ 28.00 Selling and Administrative 2.00 Total Required: $ 30.00 a) Prepare a contribution income statement for the month. b) Determine the unit contribution margin and contribution margin ratio.