The following four months of data were collected on utility cost and the number of labor hours in a factory. Utility Labor Month cost hours January $22,100 3,975 February 24,600 5,430 March 23,500 4,400 April 20,140 3,200 Refer to Figure 3-11. Using the high-low method, compute the variable rate for the utility cost. $1.02 $2.80 $1.07 $2.00