3.Comprehensive Problem: Iron Decor manufactures decorative iron railings. In preparing for next year's operations, management has developed the following estimates: Total Per Unit Sales (20,000 units).. $1.000,000 $50.00 Direct materials... Direct labor (variable).$50,000 2.50 Manufacturing overhead: $200,000 $10.00 Variable $70,000 $3.50 $80,000 $4.00 Fixed. Selling& administrative: Variable.. $100,000 S5.00 $30,000 $1.50 Fixed.. Required Compute the following items a. Unit contribution margin $29 b. Contribution margin ratio. C. If the sales volume increases by 20% with no change in total fixed expenses, what will be the change in net operating income? d. Break-even in units. e. Break-even in dollar sales. f. What would be the sales in units that will assure the company to gain its $325,000 profit? g. What would be the sales in dollars that will assure the company to gain its $165,500 profit? h. Margin of safety. i. What is the degree of operating leverage if the company? What is this number mean to the company