Astore plans to sell a total of 1200 items over the course of one year. the manager plans to place several orders of the same size spaced equally throughout the year, and wants to determine how many items to include in each order. her goal is to find the order size that minimizes the total inventory costs (such an order size is called the economic order quantity). additionally, we know the following: the ordering cost for each delivery is $75. the carrying cost per item is $8. find the objective equation (the formula for the total inventory costs) in terms of x (order size) and r (number of orders).