Qty 2) A company begin stocking remote control devices. Expected monthly demand is 800 units. The controllers can be purchased from either supplier A or B. Their price lists are as follows: Supplier A Supplier B Qty Unit price Units price 1-199 4.00 1-149 4.10 200-399 3.8 150-349 3.90 400+ 3.6 350+ 3.70 Ordering cost is $40 and Annual Holding cost is $6.00 per unit. a) Which supplier should be used? b) What order qty is optimal if the intent is to minimize total annual cost