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	900		$	5,450
February	1,800		$	6,900
March	2,400		$	8,100
April	600		$	3,600

Using the high-low method, the estimated total fixed cost for utilities is:

Multiple Choice

• $1,500.

• $3,600.

• $6,000.

• $3,300.

• $2,100.