PLEASE ANSWER IT ASAP

Lavona has the following inventory purchases and sales Purchases March 900 units es 30 per unit October 350 unitses 29 per unit Sales December 650 unipse 5 45 per unit Required A Calculate the Sales, Cost of Goods Sold, Ending inventory and Gross Proht for the year using the below valuation method under the perpetual method: 1 FIFO (7 Marks) 2 AVCO 7 Marks) 3. LIFO (7 Marks) B. Inventory is valued at the lower of historical cost and net realizable value. Explain the net realizable Value (4 marks)