Date		Transaction		Quantity		Price/Cost
1/1		Beginning inventory		1,700		$15
2/4		Purchase		2,700		22
2/20		Sale		3,200		37
4/2		Purchase		3,700		28
11/4		Sale		2,900		40

Compute cost of goods sold, assuming Sheridan uses

Periodic system, FIFO cost flow		$
(b)		Perpetual system, FIFO cost flow		$
(c)		Periodic system, LIFO cost flow		$
(d)		Perpetual system, LIFO cost flow		$
(e)		Periodic system, weighted-average cost flow		$
(f)		Perpetual system, moving-average cost flow		$

I have the answers for periodic but not perpetual. please help step by step.