(Tierman Gallery Part A) The Tierman Gallery distributes to its visitors a brochure to its collections. There are about 20800 visitors per year. The unit cost is $2, the holding cost for a brochure is 10% of the unit cost and it costs $30 to place an order. The unit time is 1 week and it takes 2 weeks till printed brochures are delivered. [OQ] (Tierman Gallery Part A) Tierman should place an order when the on-hand inventory reaches ___.