Answer and Explanation:
The computation is shown below:
(a)
Sales = 30 × 12,000 units = $360,000
(Less) variable costs = 21 × 12,000 units = $252,000
(Less) fixed costs = $90,000
Operating income = $18,000
(b)
Break even point in units be X
X × 30 = X × 21 + $90,000
9X = $90,000
X = 10,000 units
Now
Break even point in dollars is
= 10,000 × $30
= $300,000