Given the following cost and activity observations for Smithson Company's utilities, use the high-low method to calculate Smithson's fixed costs per month.

	Cost	Machine Hours
January	$75,830	10,100
February	126,860	18,200
March	88,800	12,100
April	108,830	15,300

a.$12,200

b.$20,700

c.$9,800

d.$39,000