Grencia Company uses a periodic inventory system. For 2018 and 2019, Grencia has the following data (assume all purchases and sales are for cash):

Required:
1. Compute cost of goods sold, the cost of ending inventory, and gross margin for each year using FIFO.
2. Compute cost of goods sold, the cost of ending inventory, and gross margin for each year using LIFO.
3. Compute cost of goods sold, the cost of ending inventory, and gross margin for each year using the average cost method. (Use four decimal places for per-unit calculations and round all other numbers to the nearest dollar.)
4. Which method would result in the lowest amount paid for taxes?
5. Which method produces the most realistic amount for income? For inventory? Explain your answer.
6. What is the effect of purchases made later in the year on the gross margin when LIFO is employed? When FIFO is employed? Be sure to explain why any differences occur.
7. If you worked Problem 6-68B, compare your answers. What are the differences? Be sure to explain why any differences occurred.

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Purchase Price Sale Price Units (per unit) Activity (per unit) 2018 Beginning inventory Purchase 1, Feb. 25 Sale 1, Apr. 15 Purchase 2, Aug. 30 Sale 2, Nov. 13 Purchase 3, Dec. 20 100 $45 700 600 500 52 $90 56 600 400 90 58 2019 Sale 3, Mar. 8 Purchase 4, June 28 Sale 4, Dec. 18 400 90 900 62 200 90