please help

Blue Ridge Marketing Inc. manufactures two products, A and B. Presently, the company uses a single plantwide factory overhead rate for allocating overhead to products. However, management is considering moving to a multiple department rate system for allocating overhead. The following table presents information about estimated overhead and direct labor hours. Using a single plantwide rate, determine the overhead rate per unit for Blue Ridge Marketing Inc.'s Product B. $144.00 $320,00 $496.00 $640.00