3. Comprehensive Problem: Iron Decor manufactures decorative iron railings. In preparin management has developed the following estimates: Total Per Unit Sales (20,000 units)......... ........... $1,000,000 $50.00 Direct materials............ $200,000 $10.00 Direct labor (variable)... $50,000 $2.50 Manufacturing overhead: Variable.. $70,000 $3.50 Fixed............ $80,000 $4.00 Selling & administrative: Variable... $100,000 $5.00 Fixed...... $30,000 $1.50 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 tot 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 compa What would be the sales in dollars that will assure the com h. Margin of safety i. What is the degree of operating leverage if the company? V company