Answer:
Option (a) is correct.
Step-by-step explanation:
Direct materials cost per unit:
= Change in cost ÷ Change in activity
= ($ 124,200 - $ 103,500) ÷ (6,000 units - 5,000 units)
= $20,700 ÷ 1,000 units
= $20.7
Direct labor cost per unit:
= Change in cost ÷ Change in activity
= ($339,000 - $282,500) ÷ (6,000 units - 5,000 units)
= $56,500 ÷ 1,000 units
= $56.5
Variable manufacturing overhead per unit:
= Change in cost ÷ Change in activity
= ($679,800 - $667,000) ÷ (6,000 units - 5,000 units)
= $12,800 ÷ 1,000 units
= $12.8
Therefore,
Total variable manufacturing cost per unit:
= Direct materials cost per unit + Direct labor cost per unit + Variable manufacturing overhead per unit
= $20.7 + $56.5 + $12.8
= $90