a. Calculate the overhead per direct labour hour using a departmental rate.
b. Calculate the total overhead cost allocated to each of the four product groups using the departmental rate
c. Calculate the costs per cost driver under activity-based costing
d. Calculate the total overhead cost allocated to each of the four product groups using activity-based costing
e. Comment on the approaches to costing and the differences between your answer to (b) and (d) above.