The Fuller Company has provided the following information Month Direct Labour Hours Factory Overhead July 23,000 $460,475 August 26,400 $565,280 September 18,800 $419,010 October 21,600 $447 970 November 28,600 $543,470 December 19,400 $437,020 Fuller Company uses the high-low method to analyze mixed costs. The cost function would be stated as: Select one: @a, y = 180,250 + 12.70x b.y = 180,250 + 19.24x oc. y = 128 260 + 12.70X O d y = 57 184 + 19.24x