Final answer:
The plantwide predetermined overhead rate for Mickley Company cannot be determined based on the given data.
Step-by-step explanation:
The plantwide predetermined overhead rate for Mickley Company can be determined by dividing the estimated manufacturing overhead cost by the estimated total direct labor-hours. In this case, the information provided about labor cost is not relevant to calculating the predetermined overhead rate. We need the estimated manufacturing overhead cost and the estimated total direct labor-hours to determine the rate, which are not included in the given information. Therefore, the plantwide predetermined overhead rate for Mickley Company cannot be determined based on the given data.