Please help me with #3 and #4, thank you!

3. Compute the cost assigned to ending inventory using (a) FIFO, (b) LIFO, (c) weighted average, and (c0 specific identification. For specific identification, units sold consist of 600 units from beginning inventory, 300 from the February 10 purchase, 200 from the March 13 purchase, 50 from the August 21 purchase, and 250 from the September 5 purchase. 6 Answer is not complete. (a) FIFO $ 30,000 0 (b) LIFO $ 18,000 9 (c) Weighted average $ 17,156 a (d) Specic identication 4. Compute gross profit earned by the company for each of the four costing methods. (Round your average cost per unit to 2 decimal places. Round your final answers to the nearest whole dollar amount.) 6 Answer is not complete. Sales Less: Cost of goods sold Gross prot $ 0 $ 0 $ 0 $ 0