A. Amitabh sells products door to door, and for an upcoming promotion, he must decide how many units of Pumpkin Spice shampoo to order. He buys each bottle of shampoo for $2.20. He sells each bottle for $8.00. If there are leftover bottles, he can sell them at $0.25 each to a reseller such as Family Dollar. Amitabh estimates that mean demand is 120 with standard deviation of 40. Production lead times are long, and this is a one-time promotion for the fall, so he's got one shot to get this right. (0.5 points) a. What is the critical fractile (Customer service level)? Is this a Low margin good or a High margin good? b. Assuming a normal distribution, what is the optimal amount to order