The following information is available for a company's utility cost for operating its machines over the last four months. onth January February Harch April Machine hours Utility cost 1, 070 1, 970 2, 740 770 85, 620 $7, 240 58, 100 $3, 890 Using the high-low method, the estimated variable cost per unit for utilities is: Multiple Choice $5.77 $2.96. $2.14 $3.79. $5.05