11. OPTIMAL INVENTORY STRATEGY: An office supply store expects to sell 1380 units of a specific model of printer over the next year with sales at a relatively constant rate. The carrying cost, based on average yearly inventory, is $6 per printer. To order additional printers there is a xed shipping cost of $115 for the entire delivery plus an additional $20 for each printer. The manager of the store would like to place r equal sized orders of x printers at regular, evenly spaced intervals throughout the year so as to minimize the overall cost. How many orders should be placed over the 12-month period, and how many printers should be included in each order? Also, what will be the minimum cost? (You must prove your result is a minimum using Theorem 9.) Write your Constraint Equation: Write your Target Function: Complete the remaining steps of the