Determine the ending inventory and the cost of goods sold under each of the assumed cost flow methods (FIFO, LIFO, and average-cost). Prove the accuracy of the cost of goods sold under the FIFO and LIFO methods. (Round per unit cost to 3 decimal places, eg. 15,647 and final answers to 0 decimal places, eg. 5,125. ) Bramble Corp. Inc. had a beginning inventory of 100 units of Product RST at a cost of $8 per unit. During the year, purchases were: Bramble Corp, uses a periodic inventory system. Sales totaled 1,440 units. (a) Determine the cost of goods available for sale. The cost of goods available for sale Calculate average cost per unit. (Round answer to 3 decimal places, eg. 2.237) Average cost per unit \$