The following inventory transactions took place for NPR Corporation for the month of May:

Date		Event	Quantity	Cost/Selling Price
	May 1	Beginning Inventory	1,000	$3.55
	May 5	Purchase	6,000	3.10
	May 10	Purchase	2,000	3.75
	May 15	Sale	3,000	6.00
	May 20	Sale	2,000	6.00
	May 22	Purchase	5,000	3.45
	May 24	Purchase	2,000	3.75
	May 25	Sale	7,000	6.00

Required

1. Calculate the ending inventory balance for NPR Corporation, assuming the company uses a periodic inventory system and the weighted average cost formula.