Answer: $11.60
Explanation:
Predetermined overhead rate = Fixed overhead rate + Variable manufacturing overhead per direct labor-hour
Assembly Department's predetermined overhead rate is based on direct labor-hours.
Fixed overhead rate = Total fixed manufacturing overhead cost for Assembly / Direct labor hours for Assembly
= 57,400 / 7,000
= $8.20 per labor hour
Predetermined overhead rate for Assembly = 8.20 + 3.40
= $11.60