Answer:
A. 21 MH per unit of RST
Explanation:
Total cost = Direct material + Direct labor + Overhead
$80 = $15 + $23 + Overhead
Overhead = $80 - $15 - $23
Overhead = $42
Plant-wide overhead rate = Total estimated manufacturing overhead / Total estimated machine hours
Plant-wide overhead rate =$300,000 / 150,000 machine hours
Plant-wide overhead rate =$2 per machine hours
Machine hour per unit of RST = Overhead per unit of RST / Plant wide overhead rate
Machine hour per unit of RST = $42/$2
Machine hour per unit of RST = 21 machine hour per unit of RST
Thus, the machine hour per unit of RST is 21 Machine Hour per unit of RST.