Aria operates a popular bakery in Melbourne, known for its artisanal breads. To maintain her bakery's reputation for quality, she sources a special type of flour from a nearby supplier. The details of her flour supply requirements and costs are as follows: * The supplier charges $1.20 per kilogram of flour, along with a fixed delivery fee of $30 per order, regardless of the order's size. * Aria's bakery incurs a holding cost of $0.05 per kilogram of flour per month. * To meet her bakery's production demands, Aria needs 12,000 kilograms of flour each month. What is the ideal quantity of flour Aria should order each time to minimize the combined cost of ordering and holding cost