Demand for phones at Amazon is 5,000 per month. The holding cost at Amazon is 25 percent and the company incurs a fixed cost of $500 for each order placed. The supplier offers quantity discount with a price of $200 per phone for all orders under 10,000, a price of S195 for all orders of 10,000 or more but under 20,000 and a price of $190 for all orders of 20,000 or more A. How many phones should Amazon order per replenishment in order to minimize the total inventory cost? 8. What is the cycle inventory at Amazon? C. Determine the average flow time in days