Koebel Corp uses a job order costing system with manufacturing overhead applied to products on the basis of direct labor hours. For the upcoming year, Koebel Corp estimated total manufacturing overhead cost at $921,600 and total direct labor hours of 51,200. Koebel Corp 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 $902,900 and 48,900 direct labor hours were used. (a) Calculate the predetermined overhead rate Overhead Rate per hour (b) Calculate how much manufacturing overhead will be applied to production (c) Is overhead over- or underapplied? By how much? (Input the amount as positive value.) (d) What account should be adjusted for over-or underapplied overhead? Should the balance be increased or decreased