Q. Shoe Stores carries a basic black dress shoe for men which sell at a rate of 500 each quarter. Their current policy is to order 500 per quarter, with a fixed cost of $30/order. Annual holding cost is 20% of cost of items held. Subsequent cost structure is applicable:
Order Quantity Price/pair
0-99 $36
100-199 32
200-299 30
300+ 28
For a price of $36, optimal order quantity is