Solution :
a).
= $ 350 - $ 290
= $60
The current break even sales =
= 13,000 units
Therefore, the current break-even sales (units) = 13,000 units
b). The Contribution Margin Ratio = Selling Price Per Unit - Variable Cost Per Unit
= $390 - $290
= $ 100
= 7,800 units.
So, the answer is 7800 units.