Yonge Manufacturing uses departmental cost driver rates to allocate manufacturing overhead costs to products. Manufacturing overhead costs are allocated based on machine hours in the Machining Department and based on direct labor hours in the Assembly Department. At the beginning of 2020, the following estimates were provided for the coming year:

	Machining	Assembly
Direct labor cost	$500,000	$900,000
Manufacturing overhead costs	$420,000	$240,000
Direct labor-hours	30,000	60,000
Machine-hours	80,000	20,000

For the Machining Department, what is the manufacturing overhead cost driver rate?

$4.20 per machine hour

$5.25 per machine hour

$4.00 per machine hour

$4.67 per machine hour