AMK Industries incurred the following costs at the different activity levels expressed in machine hours: Period (2019) Hours Service Costs ($) July 2,100 13,600 August 2,800 15,800 September 2,200 14,500 October 3,000 16,200 November 2,600 14,900 December 2,500 15,000 Required: (a) Use the High/Low method to separate service costs into fixed and variable costs. (b) Use the "least square method" (regression analysis) to separate into fixed and variable costs. (c) Using the results calculated in (part ii) estimate the fixed and variable costs when 3,500 hours are expected to be used in January 2020. (d) List two (2) advantages of the high low method