The following information is available for Mazoon company's electricity cost for operating its heavy machinery over the last quarter of the year 2020. Month Machine hours Electricity cost September 1,800 $ 11,900 October 1.300 $ 5,200 November 4.800 $ 15,200 December 6,500 $ 19,200 Using the high-low method, the estimated variable cost per machine hour for total cost of electricity is approximately: O a. $2.95 O b. $2.86 O c. $0.37 d. None of the given answers