The Tiernan Gallery and Art Museum Distributes to Its Visitors

Essay

The Tiernan Gallery and Art Museum distributes to its visitors a printed guide to its collections. There are about 18000 visitors per year. Holding costs for the brochures are 20% and it costs $30 to place an order with the printer. The printer has offered the following discount schedule: $$\begin{array} { c c c } \text { Category } & \text { Order Size } & \text { Unit Cost } \\\hline 1 & 0 - 1499 & \$ 2.50 \\2 & 1500 - 2999 & \$ 2.20 \\3 & 3000 \text { and over } & \$ 1.80\end{array}$$ How many brochures should be printed at a time?