The following information is available for a company's utility cost for operating its machines over the last four months.

Month	Machine hours		Utility cost
January	970		$	6,520
February	1,870		$	7,040
March	2,540		$	8,100
April	670		$	5,060

Using the high-low method, the estimated variable cost per machine hour for utilities is:

Multiple Choice

• $4.42.

• $4.87.

• $1.63.

• $7.55.

• $3.19.