Final answer:
The question does not provide sufficient information to determine the plantwide predetermined overhead rate for Mickley Company. Key details such as total overhead costs and the allocation base are missing, making it impossible to calculate the rate.
Step-by-step explanation:
The information provided for Mickley Company does not offer enough detail to accurately calculate the plantwide predetermined overhead rate. To determine this rate, you would typically divide the total estimated overhead costs by the total estimated amount of the allocation base (often direct labor hours, machine hours, or direct labor cost).
Given that the question only provides a set of incomplete data without specific total overhead costs or a clear allocation base, it is not possible to choose one of the proposed rates confidently.