Leaky Pipe, a local retailer of plumbing supplies, faces demand for one of its SKUs at a constant rate of 18,700 units per year. It costs Leaky Pipe $5 to process an order to replenish stock and $5.00 per unit per year to carry the item in stock. Stock is received 15 working days after an order is placed. No backordering is allowed. Assume 325 working days a year.

a. Leaky Pipe's optimal order quantity is ____ ? units. (Enter your response rounded to the nearest whole number.)