Can some one check my anwers please, my answers are in red?

1. Contribution margin = sales - variable 2. Assume that ROK Company has fixed costs of $100,000 and wants to earn a profit of $400,000. If ROK's contribution margin per unit is $12.50, how many units must ROK sell to reach their goal? 40,000 units 3. ROK Company has provided you with the following information:| Selling Price per Unit: $20 Variable Costs per Unit: $14 Fixed Costs: $3,600 Breakeven in Units: 600 a. Assume that the selling price is increased by 20% and fixed costs increase by $400. How many units must be sold to earn a profit of $5,600? 960 b. Using the original information above what is the breakeven point in sales? 12,000 c. Using the information in b above, assume that actual (expected sales) are $20,000. What is the margin of safety in dollars? 8,000 d. Using the information above, what is the Margin of Safety Ratio? 40%