Wrap Corporation is a job-order costing company that uses activity-based costing to apply overhead to jobs. The following overhead activities were budgeted for the year:

Activity	Cost	Driver	Amount of Driver
Setups	$220,000	Number of setups	8,000
Purchasing	210,000	Number of parts	30,000
Other overhead	260,000	Direct labor hours	80,000

The following information about the jobs was given for August:

	Job 201	Job 202	Job 203	Job 204
Balance 8/1	$64,500	$40,250	$31,400	$ 0
Direct materials	$64,000	$32,300	$21,000	$16,000
Direct labor	$82,000	$39,600	$45,000	$25,000
Number of setups	30	15	40	190
Number of parts	200	70	500	400
Direct labor hours	4,000	2,300	5,000	1,600

By August 31, Jobs 202 and 203 were completed and sold. The remaining jobs were still in process. What is the activity rate for purchasing?

a.$9

b.$5

c.$7

d.$6