Answer:
See below.
Step-by-step explanation:
Contribution margin income statement is as follows,
Sales (4,550*305) 1,387,750
Less: Variable costs
Plastic for casting 127,400
Wages 423,150
Drum Stand 168,350
Variable selling 118,300
Contribution 550,550
Less: Fixed costs
Taxes on factory 9,500
Maintenance 19,000
Depreciation 79,000
Lease of equipment 19,000
Accounting staff 69,000
Admin staff 149,000
Profit before tax 206,050
Tax @ 40% 82,420
Profit after tax 123,630
Contribution margin per unit can be calculated as,
Contribution margin / unit = Total contribution / Number of units
Contribution Margin / unit = 550,550 / 4550 = $121/unit
Contribution margin % = 121/305 = 39.6%
Hope hat helps.