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Panamint Systems Corporation is estimating activity costs associated with producing disk drives, tapes drives, and wire drives. The indirect labor can be traced to five separate activity pools. The budgeted activity cost and activity base data by product are as follows:

Line Item Description	Activity Cost	Activity Base
Procurement	$370,000	Number of purchase orders
Scheduling	250,000	Number of production orders
Materials handling	500,000	Number of moves
Product development	730,000	Number of engineering changes
Production	1,500,000	Machine hours

Line Item Description	Number of Purchase Orders	Number of Production Orders	Number of Moves	Number of Engineering Changes	Machine Hours	Number of Units
Disk drives	4,000	300	1,400	10	2,000	2,000
Tape drives	4,000	150	800	10	8,000	4,000
Wire drives	12,000	800	4,000	25	10,000	2,500

The activity-based cost (rounded to the nearest cent) for each disk drive unit is

a. $130.69

b. $92.25

c. $394.12

d. $279.57