LO4 Perpetu E6A. Refer to the data provided in E4A 1. U sing the perpetual inventory system, compute the cost of ending invento of goods sold, and gross margin. Use the average-cost, FIFO, and LIF costing methods. (Round unit costs to the nearest cent.) Cost 2. ACCOUNTING CONNECTION Explain the reasons for the differences in gross mar gin produced by the three methods. Periodic and Perpetual Systems and Inventory Costing Methods LO4 Perpetu E6A. Refer to the data provided in E4A 1. U sing the perpetual inventory system, compute the cost of ending invento of goods sold, and gross margin. Use the average-cost, FIFO, and LIF costing methods. (Round unit costs to the nearest cent.) Cost 2. ACCOUNTING CONNECTION Explain the reasons for the differences in gross mar gin produced by the three methods. Periodic and Perpetual Systems and Inventory Costing Methods