33. A new textbook is published in the spring of 2011. Your campus bookstore buys 400 copies at $70 each in June, an additional 1,000 copies in August at $72 each, and 600 copies in December at $75 each. At the end of December 2011, the bookstore has sold 1,900 copies of the text. Find the cost of goods sold and the cost of ending inventory: a) under the weighted average cost method. b) under the FIFO method. c) under the LIFO method