Panamint Systems Corporation is estimating activity costs associated with producing disk drives, tapes drives, and wire drives. The indirect labor can be traced to four separate activity pools. The budgeted activity cost and activity base data by product are provided below. Activity Cost Activity Base Procurement $300,200 Number of purchase orders Scheduling 200,200 Number of production orders Materials handling 421,500 Number of moves Product development 741,400 Number of engineering changes Production 1,490,300 Machine hours Number of Purchase Orders Number of Production Orders Number of Moves Number of Engineering Changes Machine Hours Number of Units Disk drives 3,880 370 1,270 15 2,200 1,500 Tape drives 1,500 225 580 3 8,800 4,200 Wire drives 11,300 880 3,600 27 10,000 2,800 The activity rate for the production cost pool is a. $18 per machine hour b. $148.31 per machine hour c. $70.97 per machine hour d. $77.34 per machine hour