ABC Manufacturing Company uses a job-order costing system. The company uses predetermined overhead rates in applying manufacturing overhead to individual jobs. The predetermined overhead rate in the Chair Department is based on direct labour hours, the rate in the Table Department is based on machine hours, and the rate in the Desk Department is based on direct labour cost. At the beginning of the most recent year, members of the management team made the following estimates for the year:

(Estimated) Department

Chair Table Desk

........ Direct labour hours........................................... 40,000 26,000 20,000

........ Machine hours..................................................... 50,000 18,000 30,000

........ Security guards hours..................................... 80 70 60

........ Direct labour cost.............................................. $500,000 $250,000 $320,000

........ Direct materials.................................................. $65,000 $56,000 $32,000

........ Indirect materials.............................................. $20,000 $30,000 $40,000

........ Total manufacturing overhead.................... $220,000 $234,000 $112,000

........ Administrative salaries................................... $100,000 $75,000 $80,000

The records show the following information for Job 1A, which was entered into production on June 23 and completed on July 18:

Department

Chair Table Desk

Direct labour hours........................................... 350 160 100

Machine hours..................................................... 100 50 95

Direct labour cost.............................................. $1,600 $1,200 $1,400

Direct materials.................................................. $600 $1,250 $2,000

On December 31, the company showed the following actual costs and operating data for all jobs worked on during the year: Department

Chair Table Desk

........ Direct labour hours........................................... 41,000 28,000 23,000

........ Machine hours..................................................... 52,000 17,600 32,000

........ Direct labour cost.............................................. $506,000 $240,000 $310,000

........ Direct materials.................................................. $63,400 $54,300 $30,600

........ Manufacturing overhead................................ $230,000 $235,000 $108,000

Instructions

a) Calculate the predetermined overhead rates for the three departments.

b) Calculate the total manufacturing overhead applied to Job 1A.

c) Calculate the amount of under- or over-applied overhead in each department at the end of the year and indicate whether it is under- or over-applied.

d) Would you want to re-evaluate any of the predetermined overhead rates and if so, why.