The Aust Corporation has gathered the following data on its copy machine costs for the first eight months of the year.

Month		Number of Copies			Total Copy Cost
January		40,000			$ 3,500
February		35,000			$ 3,200
March		60,000			$ 4,100
April		80,000			$ 5,100
May		85,000			$ 5,600
June		75,000			$ 4,800
July		82,000			$ 5,300
August		105,000			$ 6,000

Using the high-low method, what is the variable cost per copy? (Round answer to 2 decimal places, e.g. 15.25.)

Variable cost

$

per copy