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	$337,700	Number of purchase orders
Scheduling	240,200	Number of production orders
Materials handling	468,300	Number of moves
Product development	796,500	Number of engineering changes
Production	1,541,200	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	3,930	390	1,250	15	2,400	1,600
Tape drives	2,400	245	530	4	9,600	4,400
Wire drives	12,000	900	3,700	30	10,800	2,700

The activity rate (rounded to the nearest dollar) for the product development cost pool is

a. $34,136 per engineering change

b. $16,255 per engineering change

c. $73,148 per engineering change

d. $8,128 per engineering change