Calculating Manufacturing Overhead Rates Windsor Company, accumulated the following data for 2017 : a. Calculate the plantwide manufacturing overhead rate using machine hours as the allocation base. \& per machine hour b. Calculate the plantwide manufacturing overhead rate using direct labor hours as the allocation base. per direct labor hour c. Calculate department overhead rates using machine hours in Milling and direct labor hours in Finishing as the allocation bases. per Milling Dept. machine hour per Finishing Dept. direct labor hour d. Calculate department overhead rates using direct labor hours in Milling and machine hours in Finishing as the allocation bases. $ per Milling Dept. direct labor hour per Finishing Dept. machine hour