4. In the first month of operations, ABCC. opened a new store location and bought merchandise in the following order: January 1:300units @ \$7 January 8:450 units@\$8 January 29:750 units@\$9 Assuming that 900 units are on hand at the end of the month, calculate the cost of goods available for sale, ending inventory, and cost of goods sold under the (a) FIFO, (b) LIFO, (c) weighted average cost flow assumptions. Assume a periodic inventory system is used