Dearden Corporation uses a job-order costing system with a single plantwide predetermined overhead rate based on machine-hours. The company based its predetermined overhead rate for the current year on total fixed manufacturing overhead cost of $144,000, variable manufacturing overhead of $2.00 per machine hour, and 60,000 machine-hours. The predetermined overhead rate is closest to: Select one: O a. 5440 per machine hour O b.56.40 per machine-hour O c. $2.00 per machine-hour O d. 52.40 per machine hour