11. The manager at a local university bookstore wishes to apply the EOQ model to de- termine the order quantity for one of its products: mechanical pencils. The annual demand for mechanical pencils is 400 units. The ordering cost for the product is $20 per order and the wholesale price of a mechanical pencil is $4. Assume that the bookstores annual holding rate is 10% (e) Compute the annual ordering cost when the optimal order quantity is used. (f) Compute the annual purchase cost when the optimal order quantity is used. (g) Compute the total annual cost when the optimal order quantity is used. (h) How many orders are placed per year when the optimal order quantity is used