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 $ 10,900 October 800 $ 6.200 November 5,800 $ 17,200 December 4,600 $ 14,200 Using the high-low method, the estimated variable cost per machine hour for total cost of electricity is approximately: O a $2.11 O b. $2.2 OC. $2.97 O d. $0.45 O e. None of the given answers