The following information is available for ACT230 Company: Beginning inventory First purchase 600 units at $4 900 units at $6 500 units at $7 Second purchase Assume that ACT 230 uses a periodic inventory system and that there are 700 units left at the end of the month. Total sales revenue is $15,000 for the month. Instructions Compute the cost of ending inventory, cost of goods sold, and gross profit under the (a) FIFO method. (b) LIFO method. (c) Average-cost method.