The following information is available for a company's utility cost for operating its machines over the last four months.

a. $5.37.

b. $5.10.

c. $2.05.

d. $2.91.

e. $3.77.

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 1,090 1,990 2,780 790 Utility cost $5,640 $7,280 $8,100 $4,030 Using the high-low method, the estimated variable cost per unit for utilities is