Post Card Depot, an large retailer of post cards, orders 6,621,759 post cards per year from its manufacturer. Post Card Depot plans on ordering post card 11 times over the next year. Post Card Depot receives the same number of post cards each time it orders. The carrying cost is $0.15 per post card per year. The ordering cost is $396 per order.

What is the annual ordering cost of the post card inventory?