The inventory data for an item for November are:

Nov. 1	Inventory	18 units at $20
4	Sold	10 units
10	Purchased	30 units at $21
17	Sold	20 units
30	Purchased	10 units at $22

Using the perpetual system, costing by the last-in, first-out method (LIFO), what is the cost of the merchandise inventory of 28 units on November 30?

$590

$600

$610

$620