Can someone please help me with the three things highlighted in yellow? Thanks! I am very lost.

25th Century Electronic Center began October with 100 units of merchandise inventory that cost $78 each. During October, the store made the following purchases: E: (Click the icon to view the purchases.) 25th Century uses the periodic inventory system, and the physical count at October 31 indicates that 130 units of merchandise inventory are on hand. Read the requirements - X Data Table Oct. 3 12 40 units @ $ 80 each 60 units @ $ 82 each 40 units @ $ 94 each 18 Print Done Requirement 1. Determine the ending merchandise inventory and cost of goods sold amounts for the October financial statements using the FIFO, LIFO, and weighted average inventory costing methods. FIFO LIFO 10,200 Weighted average 10,660 11,080 Ending inventory Cost of goods sold 8,600 9.480 9,020 Requirement 2. Sales revenue for October totaled $25,000. Compute 25th Century's gross profit for October using each method. FIFO Cost LIFO Cost 19570 Weighted-average 15602.50 Gross profit 20770