Fabricators, Inc. wants to increase capacity by adding a new machine. The fixed costs for machine A are $90,000, and its variable cost is $15 per unit. The revenue is $21 per unit. The break-even point for machine A is:

a) $90,000 dollars 

 b) 90,000 units  

c) $15,000 dollars 

 d) 15,000 units

  e) cannot be calculated from the information provided  

Please select the right answer and provide explanation on how you have calculated it.