10. How many units must be sold to achieve a target profit of $8,100? (Do not round intermediate calculations.)

11. a- What is the margin of safety in dollars? (Do not round intermediate calculations.)

11.b- What is the margin of safety percentage? (Round your final answers to the nearest whole percentage (i.e, .12 should be entered as 12).)

12. What is the degree of operating leverage? (Round your answer to 2 decimal places.)