The following four months of data were collected on utility cost and the number of labor hours in a factory. Utility Labor Month hours Cost January $22,100 3,975 February 24,600 5,430 March 23,500 4,400 April 20,140 3,200 Using the high-low method, compute the fixed cost of electricity. a. $13,740 b. $10,860 c. $6,400 d. None of these choices are correct