The following information is available for electricity costs for the last six months of the year:

Month	Production Volume	Electricity Costs
February	1,000	$1,700
March	2,200	4,000
April	2,000	3,200
May	1,630	3,100
June	1,240	2,600
July	1,340	3,020

Using the high-low method, what is the estimated variable cost per unit of production? (Round your answer to two decimal places.)