HELP ME SOLVE THIS PLEASE!!!!! LIFO AND FIFO

July 1 Beginning inventory, 1,000 units at $2 each 5 Purchased 2,000 units at $2.75 each 10 Sold 2,500 units 15 Purchased 2,000 units at $4 each 25 Sold 1,500 units Calculate cost of goods sold for July assuming FIFO is used under a perpetual inventory system. Calculate ending inventory on July 31^st assuming LIFO is used under a perpetual inventory system. Calculate ending inventory on July 31^st assuming FIFO is used under a periodic inventory system. Calculate cost of goods sold for July assuming LIFO is used under a periodic inventory system