the following information is available for a company’s maintenance cost over the last seven months. month units produced maintenance cost june 90 $ 5,450 july 180 6,900 august 120 5,100 september 150 6,000 october 210 6,900 november 240 8,100 december 60 3,600 using the high-low method, estimate both the fixed and variable components of its maintenance cost.