Chu Company had the following records on a product called The Widget in 2015. January 1 April 25 July 26 October 3 October 10 Beginning Inventory Purchase Purchase Purchase Sale Units 100 200 300 250 670 Unit Cost (S) $20 $26 $28 $30 By the end of October, Chu Company had sold 670 widgets. a) Calculate the cost of goods sold and ending inventory, using the FIFO method of inventory valuation. b) Calculate the cost of goods sold and ending inventory, using the LIFO method of inventory valuation. c) Calculate the cost of goods sold and ending inventory, using the average cost method of inventory valuation. d) If the unit cost had decreased over time, i) Which inventory valuation method would have the highest cost of goods sold? ii) Which inventory valuation method would have the highest $ amount of ending inventory