Riverbed Corporation is a multi-product firm. The following information concerns one of its products, the Trinton:

Date			Transaction				Quantity			Price/ Cost
Jan.		1		Beginning inventory			1,100			$15
Feb.		4		Purchase			2,070			16
Feb.		20		Sale			2,530			31
Apr.		2		Purchase			3,160			21
Nov.		4		Sale			2,300			36

Calculate cost of goods sold, assuming Riverbed uses a periodic inventory system and FIFO cost formula.??

Calculate cost of goods sold, assuming Riverbed uses a periodic inventory system and weighted average cost formula??

Calculate cost of goods sold, assuming Riverbed uses a perpetual inventory system and moving-average cost formula.??