please explain and find cost of good sold and ending inventory

Grouper Furniture Ltd. uses a perpetual inventory system and has a beginning inventory, as at June 1 , of 480 bookcases at a cost of $114 each. During June, the company had the following purchases and sales of bookcases: (a) Your answer is incorrect. Determine the cost of goods sold and the cost of the ending inventory using the average cost formula. (Use unrounded numbers for average cost calculations. Round answers to 2 decimal places. e.g 5.52.) Cost of goods sold $ Cost of the ending inventory $