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Problem 4. (15pts) The University Bookstore orders PCs from the supplier with a quantity discount pricing schedule as follows: If the quantity is 1-49, the unit ordering cost is $1400; if the quantity is 50-89, the unit ordering cost is $1100; if the quantity is above 90 (including 90), the unit ordering cost is $900. The annual holding cost for the bookstore for a PC is $190, the setup ordering cost is $2500, and annual demand is estimated to be 200 units. Help the bookstore to determine the EOQ order size