Hill Manufacturing Uses Departmental Cost Driver Rates to Apply Manufacturing

Hill Manufacturing uses departmental cost driver rates to apply manufacturing overhead costs to products.Manufacturing overhead costs are applied on the basis of machine-hours in the Machining Department and on the basis of direct labor-hours in the Assembly Department.At the beginning of 2018,the following estimates were provided for the coming year:

The accounting records of the company show the following data for Job #846:

Required:
a.Compute the manufacturing overhead allocation rate for each department.
b.Compute the total cost of Job #846.
c.Provide possible reasons why Hill Manufacturing uses two different cost allocation rates.