Air United, Inc. manufactures two products: missile range instruments and space pressure gauges. During April, 50 range instruments and 200 pressure gauges were produced, and overhead costs of $97,045 were estimated. An analysis of estimated overhead costs reveals the following activities.

Activities Cost Drivers Total Cost
1. Materials handling Number of requisitions $40,000
2. Machine setups Number of setups 21,500
3. Quality inspections Number of inspections 33,000
$94,500
The cost driver volume for each product was as follows:
Cost Drivers Instruments Gauges Total
Number of requisitions 400 600 1,000
Number of setups 200 300 500
Number of inspections 200 400 600

Required:
a. Determine the overhead rate for each activity.
b. Assign the manufacturing overhead costs for April to the two products, using activity-based costing.