Lara Corporation has provided the following contribution format income statement. All questions concern situations that are within the relevant range.

Sales (3,000 units)-------$150,000

Variable expenses---------90,000

Contribution margin------60,000

Fixed expenses -------------48,000

Net operating income---$12,000

Required:

a. What is the contribution margin per unit?

b. What is the contribution margin ratio?

c. What is the variable expense ratio?

d. What is the break-even point in dollar sales?

e. What is the margin of safety in dollars?

please solve it with the steps