Sheffield Corp. had a beginning inventory of 115 units of Product RST at a cost of $9 per unit. During the year, purchases were: Sheffield uses a periodic inventory system. Sales totaled 1.500 units. (a) Determine the cost of goods available for sale. The cost of goods available for sale $ Calculate Average Cost. (Round answer to 3 decimal places, eg. 5.125) Determine the ending inventory and the cost of goods sold under each of the assumed cost flow methods (FIFO, LIFO, and average-cost). (Round answers to 0 decimal ploces, e.g. 150.)