The following information is available for a company's utility cost for operating its machines over the last four months. Month January February March April Machine hours 1,100 2,000 2,800 800 Utility cost $6,650 $7,300 $8,100 $4,500 Using the high-low method, the estimated variable cost per machine hour for utilities is Muluple Choice O $5.63 $289 O O O $717 $1.80 $3.96