Consider the following inventory information for last year: Number of units Cost per unit Total cost Beginning inventory, Jan 1 8,000 $20 $160,000 Purchase, March 7,000 25 175,000 Purchase, July 10,000 30 300,000 Purchase, October 5,000 41 205,000 Goods available for sale 30,000 840,000 The company uses a periodic inventory system. The year-end inventory count indicated 3,700 units in inventory. Required: a. Calculate the weighted-average cost per unit for the year. b. Calculate the ending inventory value and the cost of goods sold for the year.