Bold Vision, Inc., makes laser printer and photocopier toner cartridges. The demand rate is 620 EP cartridges per week. The production rate is 1,734 EP cartridges per week, and the setup cost is $90. The value of inventory is $140 per unit, and the holding cost is 30 percent of the inventory value. Bold Vision operates 52 weeks per year. What is the economic production lot size? The economic production lot size is cartridges. (Enter your response rounded to the nearest whole number.)