in it's first month of operations, queensland inc. made three purchases of merchandise in the following sequence: (1) 370 units at $9 each, (2) 700 units at $12 each, (3) 800 units at $11 each. A physical inventory count determined there was 600 units on hand at the end of the month. assuming queensland uses a periodic inventory system, calculate the cost of the ending inventory system and cost of goods sold using (a) FIFO and (b) average cost.( for average cost, use unrounded numbers in your calculations but round to the nearest cent for presentation purposes in your answer)