Maintenance costs at Seaside Manufacturing over the past six months are listed in the following table.

Month	Maintenance cost	Machine hours
January	$13,600	15,500
February	$14,720	16,900
March	$12,060	13,800
April	$14,480	16,600
May	$15,180	17,600
June	$13,200	15,000

Using the highlow method, what would the variable maintenance cost per machine hour be?

A. $$1.22

B.$0.86

C.$0.82

D.$ 0.87