Need help with part C with the given information.

Stratton, Inc., has collected the following information on its cost of electricity: Machine Hours Total Electricity Costs January 510 $ 240 February 540 $ 300 March 360 $ 205 April 450 $ 215 May 660 $ 290 June 690 $ 300 July 340 $ 180 August 520 $ 260 September 240 $ 120 October 750 $ 340 November 840 $360 December 600 $ 320 (a) Your answer is correct. Identify the high and low points. Machine Hours $ High point 840 $ 360 Low point 240 $ 120 Using the high-low method, compute the variable cost of electricity per machine hour. (Round unit cost to 2 decimal places, e.g. 52.75.) Variable cost $ 0.40 per machine hour (b) Your answer is correct. Compute the total fixed cost of electricity. (Round answer to 2 decimal places, e.g. 52.75.) $ 24.00 Fixed cost e Textbook and Media Attempts: 3 of 4 used (c) Represent the electricity cost function in equation form. (Round answers to 2 decimal places, e.g. 52.75.) Total cost = $ X MH+ $