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 $72,750 were estimated. An analysis of estimated overhead costs reveals the following activities. Activities Cost Drivers Total Cost 1. Materials handling Number of requisitions $30,000 2. Machine setups Number of setups 23,750 3. Quality inspections Number of inspections 19,000 $72,750 The cost driver volume for each product was as follows. Cost Drivers Instruments Gauges Total Number of requisitions 375 625 1,000 Number of setups 175 300 475 Number of inspections 225 250 475 (a)