Please help with question #2....

Best Yet Electronic Center began July with 60 units of merchandise inventory that cost $68 each. During July, the store made the following purchases: Best Yet uses the periodic inventory system, and the physical count at July 31 indicates that 90 units of merchandise inventory are on hand. Determine the ending merchandise inventory and cost of goods sold amounts for the July financial statements using the FIFO, LIFO, and weighted-average inventory costing methods. Sales revenue for July totaled $23,000. Compute Best Yet's gross profit for July using each method