Answer:
b $18.50
Explanation:
We have to divide the Procurement cost pool over the total number of order which is the cost driver of this activity.
Cost pool: 370,000
Disk drives purchase orders: Â Â Â 4,000
Tape drivers purchase orders: Â Â 4,000
Wire drivers purchase drives: Â Â 12,000 Â
  Total purchase order       20,000
Now, we know the variables values so we can calculate the rate:
$370,000 cost pool/ 20,000 purchase order = $ 18.5