The BestGuys is a discount store that sells colour televisions. The annual demand for colour television sets is 400 . The cost per order from the manufacturer is $650. The carrying cost is $45 per set each year. The store has an inventory policy that allows shortages. The shortage cost per set is estimated at $60. Determine the following (present your workings): a. The optimal order size.) b. The maximum shortage level. c. The minimum total annual inventory cost