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Sky Company uses the high-low method to analyze the cost behavior. It has determined that the machine hours best explain the company's utility cost. The company's relevant range varies from low 2,400 machines hours to a high of 4,000 machines hours, with the following data being available for the first six months of 2020 operation: Month Machine hours Utility cost July 2,880 P33,440 August 3,200 34,800 September 3,240 35,800 October 3,600 36,600 November 3,680 37,440 December 3,800 38,500 Required: (1) Using the high-low method, compute the fixed portion of utility cost and variable cost per unit. Express your answer in the equation y = a + bx. (2) Using the least square regression method, compute the fixed portion of utility cost and variable cost per unit. Express your answer in the equation y = a + bx. (3) Using your answer in (1) and (2), estimate the utility costs at 4,000 machine hours