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	$3,046	15,266
April	2,639	10,394
May	2,804	12,379
June	3,873	18,412

a.$1.69

b.$0.77

c.$0.73

d.$0.15