Glassworks Inc. produces two types of glass shelving, rounded edge and squared edge, on the same production line. For the current period, the company reports the following data. Rounded Edge Squared Edge Total
Direct materials $19,000 $43,200 $62,200
Direct labor 12,200 23,800 36,000
Overhead (300% of direct labor cost) 36,600 71,400 108,000
Total cost $67,800 $138,400 $206,200
Quantity produced 10,500 ft. 14,100 ft.
Average cost per ft. (rounded) $6.46 $9.82

Glassworks's controller wishes to apply activity-based costing (ABC) to allocate the $108,000 of overhead costs incurred by the two product lines to see whether cost per foot would change markedly from that reported above. She has collected the following information.

Overhead Cost Category (Activity Cost Pool) Cost

Supervision $5400
Depreciation Of machinery 56,600
Assembly line preparation 46,000
Total overhead $108,000

She has also collected the following information about the cost drivers for each category (cost pool) and the amount of each driver used by the two product lines.

Overhead Cost Category (Activity Cost Pool) Driver Rounded Edge Squared Edge Total
Supervision Direct Labour $12,200 $23,800 $36,00
Depreciation of machinery Machine hours 500 hours 1,500 hours 2,000 hours
Assembly line preparation Setups(number) 40 times 210 times 250 times

Required
a. Assign these three overhead cost pools to each of the two products using ABC.
b. Determine average cost per foot for each of the two products using ABC.
c. Compare the average cost per foot under ABC with the average cost per foot under the current method for each product. Explain why a difference between the two cost allocation methods exists.