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Koebel Corporation uses a job order cost system with manufacturing overhead applied to products on the basis of direct labor hours. For the upcoming year, Koebel Corporation estimated total manufacturing overhead cost at $811,200 and total direct labor hours of 50,700 . Koebel Corporation started the year with no beginning balances in either Work in Process inventory or Finished Goods Inventory. During the year, actual manufacturing overhead incurred was $783,100 and 47,500 direct labor hours were used. Required: 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 ot decreased