The following information is avallable for a company's utility cost for operating its machines over the la Machine hours 900 Month January February March April Using the high-low method, the estimated variable cost per unit for utilities is: Utility cost $5,450 $6,900 $8100 $3,600 1,800 2,400 600 o $2.50 O $4.22 O $6.17 O $3.38 o $600