Calculating Plantwide Predetermined Overhead Rate. Manufacturing overhead costs totaling $5,000,000 are expected for this coming year. The company also expects to use 100,000 direct labor hours and 40,000 machine hours.

Required:

a. Calculate the plantwide predetermined overhead rate using direct labor hours as the base. Provide a one-sentence description of how the rate will be used to allocate overhead costs to products. 

b.  Calculate the plantwide predetermined overhead rate using machine hours as the base. Provide a one-sentence description of how the rate will be used to allocate overhead costs to products.