A company starts the year with 20 units of inventory costing $20 each. In January, 10 of these units are sold for $40 each. Then, 10 new units are bought for $22 each. Shortly thereafter, 10 units are sold for $50 each. Then, 10 units are bought for $27 each. Finally, near the end of the year, 10 units are sold for $60 each. a. What is reported as the cost of ending inventory if a weighted average (periodic) system is in use? b. What is reported as the cost of ending inventory if a moving average (perpetual) system is in use?