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3-ABC textile mills produce a special cloth. The demand for this cloth is 20 yards per week. The production setup (ordering) cost is $80 per order and the holding cost is $. 40 per month. If the production rate is 200 yards per month, find; a) Compute the optimal order quantity b) Compute the production run time. c) Find the maximum inventory level. d) Find the total cost c) If SS=15, find TC