Imelda Instrument Inc. manufactures two products: missile range instruments and space pressure gauges. During January, 50 range instruments and 300 pressure gauges were produced, and overhead costs of $81,000 were incurred. An analysis of overhead costs reveals the following activities.

                        

The cost driver volume for each product was as follows.

                        

Instructions
  (a) Determine the overhead rate for each activity.
  (b) Assign the manufacturing overhead costs for January to the two products using activity-based costing.
  (c) Write a memo to the president of Imelda Instrument, explaining the benefits of activity-based costing.