Timmons Company had a beginning inventory on January 1 of 100 units of Product SXL at a cost of $20 per unit. During the year, purchases were: Date Units Unit cost Total cost Mar. 15 300 $23 July 20 250 $25 Sept. 4 350 $28 Dec. 2 100 $30 Timmons Company sold 800 units on 21 August, and it uses a periodic inventory system. Instructions a) Determine the cost of goods available for sale. (b) Determine (1) the ending inventory and (2) the cost of goods sold under LIFO Extra point: Determine the ending inventory and the cost of goods sold under FIFO use perpetual inventory system