The following activity volumes are associated with the product line for the period as a whole. Total activities for the period:

Number of

Number of

movements

Number of

set-ups

of materials

inspections

Product X

75

12

150

Product Y

115

21

180

Product Z

480

87

670

670

120

1000

You are required

(b) to calculate the cost per unit for each product using ABC principles;

(c) to comment on the reasons for any differences in the costs in your answers to (a) and (b).