Waltz Company had a beginning inventory of 400 units of Product Ribo at a cost of $8 per unit. During the year, purchases were: 600 units at $9 500 units at $10 300 units at $11 200 units at $12 Feb 20 May 5 Aug 12 Dec 8 Sales totaled 1,500 units. Instructions: 1. Determine the cost of goods available for sale. 2. Determine the cost of the ending inventory and cost of goods sold under FIFO, LIFO, and average cost