2: Dhofar Company has the following information regarding its inventory items for 2021.

Date	Event	Details
Jan. 1	Balance	500 units @ RO3.5
April 7	Purchase	300 units @ RO4.5
June 17	Sale	325 units
Aug. 13	Purchase	280 units @ RO6
Oct. 16	Sale	310 units
Nov. 12	Purchase	200 units @ RO 6.5
Dec. 21	Sale	150 units

a. Using the periodic system, determine cost of goods sold and the ending inventory balance under FIFO, LIFO, and weighted average.

b. Determine FIFO, LIFO, and weighted average under the perpetual system.