15. Muscat company has the following information for year 2020 50 @ OMR 550 OMR 27.500 50 @ OMR 600 30.000 Inventory on January 1, Year 2020 Inventories purchased during the year Cost of Goods available for sale Note: 30 units are sold in Year 2020 100 units OMR 57.500 Required: Calculate Cost of Goods Sold and Ending Inventory under LIFO, FIFO and Average cost methods