Lambert Center began operations on July 1. It uses a perpetual inventory system. During July, the company had the following purchases and sales.

		Purchases
Date		Units		Unit Cost		Sales Units
July 1		7		$62
July 6						5
July 11		3		$66
July 14						3
July 21		4		$71
July 27 (3 sales units on 7/27) 1) calculate the average cost for each unit on each given day: July 14? July 21? July 27? What is the average cost for each unit on these dates?