Each year, Shopalot Stores sells 10,000 cases of soda. The company is trying to determine how many cases to order each time it orders. It costs $150 to process each order, and the cost of carrying a case of soda in inventory for one year is 20% of the purchase price. The soda supplier offers Shopalot the schedule of quantity discounts shown in the file P12_33.xlsx, where Q is the number of cases per order. Each time an order is placed, how many cases of soda should the company order?