Pronghorn Company Inc. had a beginning inventory of 108 units of Product RST at a cost of $5 per unit. During the year, purchases were: Pronghorn Company uses a periodic inventory system. Sales totaled 1,620 units. (a) (b) Determine the ending inventory and the cost of goods sold under each of the assumed cost flow methods (FIFO, LIFO, and average-cost). (For calculation purposes, round average cost to 2 decimal places, eg. 5.25. Round answers to 0 decimal ploces, e.g. 125.)