The following information is available for DuBose Company: Unit Cost May 1 Beginning inventory May 5 Purchase May 23 Purchase Units 750 units 800 units 300 units $10 $11 Assume that DuBose uses a periodic inventory system and that a total of 1,400 units were sold to customers during May for $19 per unit. Instructions (12 points): Compute the cost of goods sold and the ending inventory under the following methods: (a) FIFO method. (b) LIFO method. (c) Average-cost method