please do number 3 and 4. thanks

Problem 5-4AA Perpetual: Alternative cost flows LO P3 Montoure Company uses a perpetual inventory system. It entered into the following calendar-year purc te Units Acquired at Cost 580 units $40 per unit 420 units $38 per unit 180 units $25 per unit Jan. 1 Beginning inventory Feb. 10 Purchase Mar. 13 Purchase Mar. 15 Sales Aug. 21 Purchase Sept. 5 Purchase Sept. 10 Sales 755 units $70 per unit 190 units @ $45 per unit 560 units@ $41 per unit 750 units $70 per unit Totals 1,930 units 1,505 units Required 1. Compute cost of goods available for sale and the number of units available for sale. 2. Compute the number of units in ending inventory 3. Compute the cost assigned to ending inventory using () FIFO, () LIFO. (d) weighted average, and (d) specific identification. For specific Identification, units sold consist of 580 units from beginning inventry, 320 from the February 10 purchase, 180 from the March 13 purchase, 140 from the August 21 purchase, and 285 from the September 5 purchase. (Round your average cost per unit to 2 decimal places.) 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.) Complete this question by entering your answers in the tabs below. gross profit earned by the company for each of the four costing methods. (Round your average cost per unit to 2 decimal places.) FIFO LIFO Average Less Cost of goods sold