Accounting for Inventory/Materials- Cost of Placing an Order Exam Question

Good afternoon John,

I’m stuck on this Exam Kit question and really need your help please.

Purchase price of an inventory item is $42 per unit
In each 3 month period the usage of the item is 2000 units
AHC associated with 1 unit is 5% of the purchase price
EOQ is 185 units

What is the cost of placing an order to 2 decimal points

So I started off as follows:
AOC=D/Q x Co
EOQ= 2x CoD /Ch and then square root

D=2000 x 4=8000 units
Q=185 units
Ch= 0.05 x $42 = $2.1

Im now very stuck and confused. I know that I need to re-arrange the above information but I don’t know how to. Can you please help me. Thanks