i need help with all parts

it opens up as i get the answers . i figured first two out i need help woth last two

Whispering Winds Corp. Inc. had a beginning inventory of 95 units of Product RST at a cost of $ 7 per unit. During the year, purchases a were: Feb. 20 610 units at $8 Aug. 12 395 units at $ 10 May 5 480 units at $9 Dec 8 100 units at $11 Whispering Winds Corp, uses a periodic inventory system. Sales totaled 1,535 units. (a) Determine the cost of goods available for sale. The cost of goods available for sale $ (61) The parts of this question must be completed in order. This part will be available when you complete the part above. (62) The parts of this question must be completed in order. This part will be available when you complete the part above. (c) The parts of this question must be completed in order. This part will be available when you complete the part above. were: Feb. 20 610 units at $8 Aug. 12 395 units at $10 May 5 480 units at $ 9 Dec 8 100 units at $11 Whispering Winds Corp. uses a periodic inventory system. Sales totaled 1,535 units. Your answer is correct. Determine the cost of goods available for sale. The cost of goods available for sale $ 14915 Your Answer Correct Answer Your answer is correct. Calculate average cost per unit. (Round answer to 3 decimal places, eg.2.237) Average cost per unit VA 8.878 (62) Determine the ending inventory and the cost of goods sold under each of the assumed cost flow methods (FIFO, LIFO, and average cost). (Round per unit cost to 3 decimal places, e.g. 15.647 and final answers to decimal places, eg. 5,125.) FIFO LIFO AVERAGE-COST The ending inventory $ The cost of goods sold $ (c) The parts of this question must be completed in order. This part will be available when you complete the part above. a W A 5