Answer:
Results are below.
Explanation:
The variable costing method incorporates all variable production costs (direct material, direct labor, and variable overhead).
Unitary production variable cost= 60 + 40 + 10
Unitary production variable cost= $110
Now, the income statement:
Sales= 300*8,400= 2,520,000
Total variable cost= 8,400*(110 + 30)= (1,176,000)
Total contribution margin= 1,344,000
Fixed manufacturing overhead= (180,000)
Fixed selling and administrative= (780,000)
Net operating income= $384,000
Finally, the break-even point in units:
Break-even point in units= fixed costs/ contribution margin per unit
Break-even point in units= 960,000 / (300 - 140)
Break-even point in units= 6,000