[16. a. Explain in your own words four costing methods of inventory with a numerical example for each {4 Marks] h. A company that uses a perpetual inventory system made the following cash purchases and sales. There was no beginning inventory. Purchased 550 units at SAP: 55 per unit Purchased 350 units at SAP. I55 per unit March 16: Sold 251] Units for SAR I35 per unit Prepare general journal entries to record the March 16 sale using the FIFO inventor}; valuation method and me LIFO inventor}:r valuation method. (4 Marks]