Callen Corp uses a normal job order costing system with manufacturing overhead applied to products on the basis of machine hours. For the upcoming year, Callen Corp estimated total manufacturing overhead cost at $270,000 and total machine hours of 45,000. During the year, actual manufacturing overhead incurred was $258,750 and 46,600 machine hours were used. a. Calculate the predetermined overhead rate. b. Calculate how much manufacturing overhead will be applied to production. c. Is overhead over-or underapplied? By how much? d. What account should be adjusted for over-or underapplied overhead? Should the balance be increased or decreased? HTML Editor - Paragra