Please show work so I can understand for my upcoming final, thank you so much

33. 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............. $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. Show your work if you want partial credit. Total points: 25 a. Unit contribution margin in dollar. b. Unit contribution margin ratio. c. Break-even in dollar sales. d. Margin of safety percentage. e. If the sales volume increases by 20% with no change in total fixed expenses, what will be the change in net operating income? Explain