To illustrate the different inventory cost flow assumptions, consider the following example of Russell Company, which purchased inventory at three different times at three different prices. May 1 Purchase 20 May 15 Purchase 20 May 20 Purchase 20 Goods available for sale 60 Cost per Unit $ 12 1 9 22 Total Cost $ 240 380 440 1,060 Russell purchased a total of 60 units, which cost a total of $1,060. On May 31st a customer purchased 20 units. Russell's selling price was $26 per unit. Under the FIFO method, what is the unit cost of the items sold? Fill in the table below, calculate Russell Company's sales revenue, cost of goods sold, gross profit and ending inventory balance under each of the three inventory cost flow assumptions. Round your answer to the nearest dollar. However, do not round intermediate calculations. Average Cost Revenue Cost of goods sold Gross profit Ending inventory