Sunshine Co Ltd produces two types of window frame, aluminium and wooden. The companys simple costing system has two direct cost categories (materials and labour) and one indirect cost pool. The simple costing system allocates indirect costs on the basis of machine hours. Recently, the owners of Sunshine have been concerned about a decline in the market share for aluminium, usually their biggest seller. Information related to Sunshines production for the most recent year follows:

Aluminium Wooden

Units sold 3,200 1,800

Selling price $125 $200

Direct material cost per unit $30 $45

Direct manufacturing labor cost per hour $16 $16

Direct manufacturing labour hours per unit 1.50 2.25

Production runs 40 85

Material moves 72 168

Machine setups 45 155

Machine hours 5,500 4,500

Number of inspections 250 150

The owners have heard of other companies in the industry that are now using an activity-based costing system and are curious how an ABC system would affect their product costing decisions. After analyzing the indirect cost pool for Sunshine, six activities were identified as generating indirect costs: production scheduling, material handling, machine setup, assembly, inspection, and marketing. Sunshine collected the following data related to the indirect cost activities:

Activity Activity Cost Activity Cost Driver

Production scheduling $95,000 Production runs

Material handling $45,000 Material moves

Machine setup $25,000 Machine setups

Assembly $60,000 Machine hours

Inspection $8,000 Number of inspections

Marketing costs were determined to be 3% of the sales revenue for each type of window. Required:

a) Calculate the cost of an aluminium window frame and a wooden window frame under the existing simple costing system.

b) Calculate the cost of an aluminium window frame and a wooden window frame under an activity-based costing system.

c) Compare the costs of the window frame in requirements (a) and (b). Explain why the simple and activity-based costing systems differ in the cost of an aluminium window frame and a wooden window frame. d) Advise how Sunshine Co. Ltd might use the new cost information from its activity-based costing system to address the declining market share for interior doors.