The inventory data for an item for November are:

Nov. 1		Inventory	20 units at $19
4		Sold	10 units
10		Purchased	30 units at $20
17		Sold	20 units
30		Purchased	10 units at $22

Using a perpetual system, what is the cost of the goods sold for November if the company uses the weighted average cost method?

a. $590

b. $610

c. $585

d. $575