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 8,800 $ 18,200 November 1,100 $ 8,200 December 6,600 $ 17,200 Using the high-low method, the estimated variable cost per machine hour for total cost of electricity is approximately: a $2.07 b. $1.3 $0.76 d. $1.64 e None of the given answers