JPL Corporation uses a periodic inventory system. At the end of the annual accounting period, December 31, 2015, the accounting records for the most popular item in inventory showed the following: Compute the dollar amount of (a) ending inventory, and (b) cost of goods sold at December 31, 2015, under each of the following inventory costing methods (SHOW COMPUTATIONS and ROUND TO THE NEAREST CENT): 1. Average cost also called weighted average(round the average cost per unit to the nearest cent)