Answer:
$17.68 per machine hour.
Step-by-step explanation:
Plant Overhead rate per machine hour = $8,500,000 + $164,500 / 490,000 machine hours
Plant Overhead rate per machine hour = $8,664,500 / 490,000 machine hours
Plant Overhead rate per machine hour = $17.68265306122449
Plant Overhead rate per machine hour = $17.68 per machine hour.