4. Lindsay Corporation uses a perpetual inventory system. As of at December 31,2020, the company's accounting records provided the following information on their product. Unit Transactions Units Cost a. Inventory, December 31, 2019 6,000 $5 b. Purchase, May 1 12,000 $6 c. Purchase, June 1 11,000 $7 d. Sale, July 1 ($14 each) 16,000 e. Purchase, August 1 10,000 $6 f. Sale, September 1 ($16 each) 13,000 g. Purchase, October 1 7,000 $8 h. Sale, November 1 ($17 each) 5,000 i. Operating expenses (excluding income tax expense), $250,000 Required: a) Prepare a statement of earnings for 2020 through pretax earnings, showing the detailed computation of cost of sales for the two cases: a. Case A - FIFO b. Case B - Weighted average b) For each case, show the computation of the ending inventory (Hint: set up adjacent columns, one for each case)