Given the following cost and activity observations for Bounty Company's utilities, use the high-low method to determine Bounty's variable utilities cost per machine hour. Round your answer to the nearest cent.

	Cost	Machine Hours
March	$3,125	14,990
April	2,603	9,506
May	2,846	11,993
June	3,681	17,881

a.$1.29

b.$0.90

c.$0.86

d.$0.13