Lucinda Company wants to develop a cost function for its maintenance costs to estimate such costs for the coming year. The following data are avatable Direct Maintenance Month Labour Hours Costs incurred June 4,000 $ 1.200 July 6,750 1,718 August 7,000 1,800 September 5,500 1,290 Using the high-low mothod, what is the fixed maintenance cost? $800 $400 O $1,200 O $900