Answer:
Note: The missing part of the question is "using variable costing and absorption costing. Explain the difference"
Solution
According to variable costing, the unit cost based was
= $8.20 + $11.20 + $9.20
= $28.6
According to absorption costing,
Total Manufacturing costs= Direct material + Direct labor + Overhead
= $8.20 + $11.20 + ($386,400/42,000 units) + $9.20
= $8.20 + $11.20 + $9.2 + $9.2
= $37.8
The difference between the variable costing and the absorption cost is because the product costing using variable costing method only includes variable costs.